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\(\left(27-x\right)+\left(15+x\right)=x-24\)
\(\Rightarrow27-x+15+x=x-24\)
\(\Rightarrow\left(27+15\right)-\left(x-x\right)=x-24\)
\(\Rightarrow42=x-24\)
\(\Rightarrow x=42+24\)
\(\Rightarrow x=66\)
Vậy \(x=66\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\( 27 - x + 15 + x = x - 24\\ \Leftrightarrow 42 = x - 24\\ \Leftrightarrow x = 66 \)
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17 - 2x = -15
2x = 17 - (-15)
2x = 32
x = 32 : 2
x = 16
--------
54 : (x + 2) = -6
x + 2 = 54 : (-6)
x + 2 = -9
x = -9 - 2
x = -11
--------
12.(3 - x) = 72
3 - x = 72 : 12
3 - x = 6
x = 3 - 6
x = -3
-------
-3(x + 5) + 18 = -27
-3(x + 5) = -27 - 18
-3(x + 5) = -45
x + 5 = -45 : (-3)
x + 5 = 15
x = 15 - 5
x = 10
-------
(x + 5)² = 9
x + 5 = 3 hoặc x + 5 = -3
*) x + 5 = 3
x = 3 - 5
x = -2
*) x + 5 = -3
x = -3 - 5
x = -8
Vậy x = -8; x = -2
--------
(3 - x)³ = 27
(3 - x)³ = 3³
3 - x = 3
x = 3 - 3
x = 0
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(27-x)+(15+x)=x-24
=> 27- x + 15 + x -x + 24 = 0 (chuyển vế)
=> -x + 66 = 0
=> -x = -66
=> x =66
(27-x)+(15+x)=x-24
27-x+15+x=x-24
-x+x-x=-24-27-15
-x=-66
x=66
Vậy x=66
![](https://rs.olm.vn/images/avt/0.png?1311)
Bài làm
(15 + x) - (x - 27) = x - 24
15 + x - x + 27 = x -24
(15 + 27) + ( x - x) = x - 24
x - 24 = 42
x = 42 - 24
x = 18
Vậy x = 18
Học & Tốt
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\(\left(27-x\right)+\left(15+x\right)=x-24\)
\(27-x+15+x=x-24\)
\(-x+x-x=-24-15-27\)
\(-x=-66\)
\(\Rightarrow x=-66\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(27-x\right)+\left(15+x\right)=x-24\)
\(27-x+15+x=x-24\)
\(32-x+24=0\)
\(56-x=0\)
\(x=56\)
(27 - x) + (15 + x) = x - 24
27 - x + 15 + x = x - 24
27 + 15 + 24 = x + x - x
66 = x
Vậy x = 66
Chúc bạn học tốt !
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a)\(x-5=-1\)
⇔\(x=4\)
b)\(x+30=-4\)
⇔\(x=-34\)
c)\(x-\left(-24\right)=3\)
⇔\(x+24=3\)
⇔\(x=-21\)
e)\(\left(x+5\right)+\left(x-9\right)=x+2\)
⇔\(x+5+x-9-x-2=0\)
⇔\(x-6=0\)
⇔\(x=6\)
f)\(\left(27-x\right)+\left(15+x\right)=x-24\)
⇔\(27-x+15+x-x+24=0\)
⇔\(66-x=0\)
⇔\(x=66\)
\(a.x-5=-1\) \(b.x+30=-4\)
\(x=\left(-1\right)+5\) \(x=\left(-4\right)-30\)
\(x=4\) \(x=-34\)
\(c.x-\left(-24\right)=3\) \(e.\left(x+5\right)+\left(x-9\right)=x+2\)
\(x=3+\left(-24\right)\) \(x+5+x-9=x+2\)
\(x=-21\) \(2x-4=x+2\)
\(2x-x=2+4\)
\(x=6\)
\(f.\left(27-x\right)+\left(15+x\right)=x-24\)
\(27-x+15+x=x-24\)
\(27+15=x-24\)
\(42=x-24\)
\(x=24+42\)
\(x=66\)
![](https://rs.olm.vn/images/avt/0.png?1311)
Phân tích vế trái \(\left(27-x\right)+\left(15+x\right)=27+15-x+x=42\)
\(\Rightarrow x-24=42\)
\(x=66\)
\(\left(27-x\right)+\left(15+x\right)=x-24\)
\(\Leftrightarrow27-x+15+x-x+24=0\)
\(\Leftrightarrow66-x=0\)
\(\Leftrightarrow x=66\)
Vậy \(x=66\)