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a) Ta có: \(4\left(x-2\right)-2\left(x+3\right)=-28\)
\(\Leftrightarrow4x-8-2x-6+28=0\)
\(\Leftrightarrow2x+14=0\)
\(\Leftrightarrow2x=-14\)
hay x=-7
Vậy: x=-7
b) Ta có: \(3x+7-9x=-11\)
\(\Leftrightarrow-6x+7+11=0\)
\(\Leftrightarrow-6x+18=0\)
\(\Leftrightarrow-6x=-18\)
hay x=3
Vậy: x=3
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a: =>x/27+1=-2/3
=>x/27=-5/3
=>x=-45
b: \(\Leftrightarrow x-4=\dfrac{2}{5}:\dfrac{20}{21}=\dfrac{2}{5}\cdot\dfrac{21}{20}=\dfrac{42}{100}=\dfrac{21}{50}\)
=>x=221/50
c: \(\Leftrightarrow x+\dfrac{2}{3}=\dfrac{4}{60}=\dfrac{1}{15}\)
=>x=1/15-2/3=1/15-10/15=-9/15=-3/5
d: \(\Leftrightarrow x\cdot\dfrac{3}{5}=\dfrac{1}{5}-\dfrac{15}{14}\cdot\dfrac{21}{20}\)
=>\(x\cdot\dfrac{3}{5}=\dfrac{1}{5}-\dfrac{3}{2}\cdot\dfrac{3}{4}=\dfrac{1}{5}-\dfrac{9}{8}=\dfrac{-37}{40}\)
=>x=-37/24
e: =>-3/7x=84/45
=>x=-196/45
f: =>11/10x=-2/3
=>x=-20/33
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-2.(-x-5)+28=20-3.(x+4)
2x+10+28=20-3x-12
2x+3x=20-12-10-28
5x=-30
x=-30:5
x=-6
Vậy x=-6
-2.(- x - 5 ) + 28 = 20 - 3.(x + 4 )
2x + 10 + 28 = 20 -3x - 12
2x + 3x = 20 - 12 - 10 - 28
5x = -30
x = -6
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\(1,\Leftrightarrow7x=42\Leftrightarrow x=6\\ 2,\Leftrightarrow36-4x=4\Leftrightarrow4x=32\Leftrightarrow x=8\\ 3,\Leftrightarrow3x=35\Leftrightarrow x=\dfrac{35}{3}\\ 4,\Leftrightarrow x-12=144\Leftrightarrow x=156\\ 5,\Leftrightarrow x-14=16\Leftrightarrow x=30\\ 6,\Leftrightarrow3x-24=\dfrac{148}{73}\Leftrightarrow3x=\dfrac{1900}{73}\Leftrightarrow x=\dfrac{1900}{219}\\ 7,\Leftrightarrow33+x=45\Leftrightarrow x=12\\ 8,Sai.đề\\ 9,\Leftrightarrow\left(x+9\right):2=39\Leftrightarrow x+9=78\Leftrightarrow x=69\\ 11,\Leftrightarrow2\left(x+7\right)=38\Leftrightarrow x+7=19\Leftrightarrow x=12\\ 13,\Leftrightarrow2\left(x-51\right)=66\Leftrightarrow x-51=33\Leftrightarrow x=84\)
\(15,\Leftrightarrow x-19=9\Leftrightarrow x=28\\ 17,\Leftrightarrow\left(x-3\right):2=48\Leftrightarrow x-3=96\Leftrightarrow x=99\\ 19,\Leftrightarrow0x=46\Leftrightarrow x\in\varnothing\\ 8,Sai.đề\\ 14,\Leftrightarrow2x=209\Leftrightarrow x=\dfrac{209}{2}\\ 16,\Leftrightarrow2x+6=157\Leftrightarrow2x=151\Leftrightarrow x=\dfrac{151}{2}\\ 18,\Leftrightarrow5\left(x+4\right)=100\Leftrightarrow x+4=20\Leftrightarrow x=16\\ 20,\Leftrightarrow\left(3x-5\right)^3=27=3^3\Leftrightarrow3x-5=3\Leftrightarrow x=\dfrac{8}{3}\)
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a) 7x-20=21
<=> 7x=41
<=> x=\(\frac{41}{7}\)
c) \(|x-5|-1=6\)
\(\Leftrightarrow|x-5|=7\)
\(\Leftrightarrow\orbr{\begin{cases}x-5=7\\x-5=-7\end{cases}\Leftrightarrow\orbr{\begin{cases}x=12\\x=-2\end{cases}}}\)
a. 7x - 20 = 21
7x = 41
x= 41/7
b. (2x + 1)^3 = 9. 9.9
(2x + 1)^3 = 9^3
2x + 1 = 9
2x = 8
x = 4
c. | x-5| -1 = 6
| x - 5 | = 7
Th1: x- 5 = 7
x = 12
Th2: x-5 = -7
x= -2
hok tốt!!!
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 3x -(-5)=20
3x+5=20
3x=20-5
3x=15
x=15/3
x=5
b) 4-7x =(-3).8
4-7x =(-24)
7x=4-(-24)
7x=28
x=28/7
x=4
c) Các số nguyên x thỏa mãn |x|<3 là -2;-1;0;1;2
d) Các số nguyên x thỏa mãn -5<x<1 là -4;-3;-2;-1;0;1
tick nha
![](https://rs.olm.vn/images/avt/0.png?1311)
3x + x + x = 13
5x = 13
x = 13/5
P/s : đợi chút mk làm phần b) sau
=> 9x-28-7x+4+20=-8
=>2x-4= -8
=>2X=-4
=>x= -2