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