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x-3-12=3\left(x+1\right)-2\left(3+2x\right)
Multiply both sides of the equation by 6, the least common multiple of 6,2,3.
x-15=3\left(x+1\right)-2\left(3+2x\right)
Subtract 12 from -3 to get -15.
x-15=3x+3-2\left(3+2x\right)
Use the distributive property to multiply 3 by x+1.
x-15=3x+3-6-4x
Use the distributive property to multiply -2 by 3+2x.
x-15=3x-3-4x
Subtract 6 from 3 to get -3.
x-15=-x-3
Combine 3x and -4x to get -x.
x-15+x=-3
Add x to both sides.
2x-15=-3
Combine x and x to get 2x.
2x=-3+15
Add 15 to both sides.
2x=12
Add -3 and 15 to get 12.
x=\frac{12}{2}
Divide both sides by 2.
x=6
Divide 12 by 2 to get 6.