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3\left(x-1\right)-2\left(x+2\right)=6x-72
Multiply both sides of the equation by 6, the least common multiple of 2,3.
3x-3-2\left(x+2\right)=6x-72
Use the distributive property to multiply 3 by x-1.
3x-3-2x-4=6x-72
Use the distributive property to multiply -2 by x+2.
x-3-4=6x-72
Combine 3x and -2x to get x.
x-7=6x-72
Subtract 4 from -3 to get -7.
x-7-6x=-72
Subtract 6x from both sides.
-5x-7=-72
Combine x and -6x to get -5x.
-5x=-72+7
Add 7 to both sides.
-5x=-65
Add -72 and 7 to get -65.
x=\frac{-65}{-5}
Divide both sides by -5.
x=13
Divide -65 by -5 to get 13.