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3\left(x+1\right)-18=2\left(x-1\right)-12
Multiply both sides of the equation by 6, the least common multiple of 2,3.
3x+3-18=2\left(x-1\right)-12
Use the distributive property to multiply 3 by x+1.
3x-15=2\left(x-1\right)-12
Subtract 18 from 3 to get -15.
3x-15=2x-2-12
Use the distributive property to multiply 2 by x-1.
3x-15=2x-14
Subtract 12 from -2 to get -14.
3x-15-2x=-14
Subtract 2x from both sides.
x-15=-14
Combine 3x and -2x to get x.
x=-14+15
Add 15 to both sides.
x=1
Add -14 and 15 to get 1.