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3\left(2+x\right)+4x-2\left(1-x\right)=x+12
Multiply both sides of the equation by 12, the least common multiple of 4,3,6,12.
6+3x+4x-2\left(1-x\right)=x+12
Use the distributive property to multiply 3 by 2+x.
6+7x-2\left(1-x\right)=x+12
Combine 3x and 4x to get 7x.
6+7x-2+2x=x+12
Use the distributive property to multiply -2 by 1-x.
4+7x+2x=x+12
Subtract 2 from 6 to get 4.
4+9x=x+12
Combine 7x and 2x to get 9x.
4+9x-x=12
Subtract x from both sides.
4+8x=12
Combine 9x and -x to get 8x.
8x=12-4
Subtract 4 from both sides.
8x=8
Subtract 4 from 12 to get 8.
x=\frac{8}{8}
Divide both sides by 8.
x=1
Divide 8 by 8 to get 1.