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(7x + 28) . [( - 75) - 5x] = 0
* 7x + 28 = 0 * ( - 75) - 5x = 0
7x = -28 5x = -75 - 0
x = -28 : 7 5x = -75
x = -4 x = -75 : 5 = -15
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a)2x=0+10
2x=10
x=10:2
x=5
b)7x=0+28
7x=28
x=28:7
x=4
c)3x=7+14
3x=21
x=21:3
x=7
d)3(x+2)=44-14
3(x+2)=30
x+2=30:3
x-2=10
x=10+2
x=12
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a) 12-3x=0
3x=12-0
3x=12
x=12:3
x=4
b)2x-26=25.12
2x-26=300
2x=300+26
2x=326
x=326:2
x=163
c)5x+28=234:3
5x+28=78
5x=78-28
5x=50
x=50:5
x=10
d)72-7x=529:23
72-7x=23
7x=72-23
7x=49
x=49:7
x=7
k cho mình nhoa~~
a, (12-3x):20=0
=> 12-3x=0
=> 3x=12
=> x= 4 Vậy x=4
b, (2x-26):12=25
=> 2x-26=300
=> 2x=326
=> x=163 Vậy x= 163
c, 234:( 5x+28)=3
=> 5x+28=78
=> 5x=50
=> x= 10 Vậy x= 10
d, 529: (72-7x)=23
=> 72-7x=23
=> 7x=49
=> x= 7 Vậy x= 7
Nhớ k cho mik nhé!!!! CẢM ƠN !!!
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\(a,x-4=11-2x\)
\(x+2x=11+4\)
\(3x=15\)
\(x=5\)
\(b.7x-10=x-28\)
\(7x-x=-28+10\)
\(6x=-18\)
\(x=-3\)
\(c.x-3.x-2=0\)
\(\left(1-3\right).x-2=0\)
\(-2.x-2=0\)
\(-2x=2\)
\(x=-1\)
\(d.|x-5|=10\)
\(\Rightarrow\orbr{\begin{cases}x-5=10\\x-5=-10\end{cases}}\)
\(\Rightarrow\orbr{\begin{cases}x=15\\x=-5\end{cases}}\)
\(e.9-25=\left[7-x\right]-\left[25+7\right]\)
\(-16=\left[7-x\right]-32\)
\(-16+32=7-x\)
\(16=7-x\)
\(x=7-16\)
\(x=-9\)
![](https://rs.olm.vn/images/avt/0.png?1311)
7x - 5x = 28
x.7 - x.5 = 28
x.(7-5) = 28
x.2 = 28
x = 28 : 2
x = 14
\(7x-28=0\)
\(7x=28\)
\(x=28:7=4\)
Vay \(x=4\)
X = 4