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3x-6=12\left(x+1\right)
Variable x cannot be equal to -1 since division by zero is not defined. Multiply both sides of the equation by x+1.
3x-6=12x+12
Use the distributive property to multiply 12 by x+1.
3x-6-12x=12
Subtract 12x from both sides.
-9x-6=12
Combine 3x and -12x to get -9x.
-9x=12+6
Add 6 to both sides.
-9x=18
Add 12 and 6 to get 18.
x=\frac{18}{-9}
Divide both sides by -9.
x=-2
Divide 18 by -9 to get -2.