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3\left(x+1\right)+2\left(2x+1\right)-\left(3x+1\right)=-12
Multiply both sides of the equation by 6, the least common multiple of 2,3,6.
3x+3+2\left(2x+1\right)-\left(3x+1\right)=-12
Use the distributive property to multiply 3 by x+1.
3x+3+4x+2-\left(3x+1\right)=-12
Use the distributive property to multiply 2 by 2x+1.
7x+3+2-\left(3x+1\right)=-12
Combine 3x and 4x to get 7x.
7x+5-\left(3x+1\right)=-12
Add 3 and 2 to get 5.
7x+5-3x-1=-12
To find the opposite of 3x+1, find the opposite of each term.
4x+5-1=-12
Combine 7x and -3x to get 4x.
4x+4=-12
Subtract 1 from 5 to get 4.
4x=-12-4
Subtract 4 from both sides.
4x=-16
Subtract 4 from -12 to get -16.
x=\frac{-16}{4}
Divide both sides by 4.
x=-4
Divide -16 by 4 to get -4.