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3\left(x+1\right)=-12-2\left(3+2x\right)
Multiply both sides of the equation by 6, the least common multiple of 2,3.
3x+3=-12-2\left(3+2x\right)
Use the distributive property to multiply 3 by x+1.
3x+3=-12-6-4x
Use the distributive property to multiply -2 by 3+2x.
3x+3=-18-4x
Subtract 6 from -12 to get -18.
3x+3+4x=-18
Add 4x to both sides.
7x+3=-18
Combine 3x and 4x to get 7x.
7x=-18-3
Subtract 3 from both sides.
7x=-21
Subtract 3 from -18 to get -21.
x=\frac{-21}{7}
Divide both sides by 7.
x=-3
Divide -21 by 7 to get -3.