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2x-12=12x-\left(x+3\right)
Multiply both sides of the equation by 6, the least common multiple of 3,6.
2x-12=12x-x-3
To find the opposite of x+3, find the opposite of each term.
2x-12=11x-3
Combine 12x and -x to get 11x.
2x-12-11x=-3
Subtract 11x from both sides.
-9x-12=-3
Combine 2x and -11x to get -9x.
-9x=-3+12
Add 12 to both sides.
-9x=9
Add -3 and 12 to get 9.
x=\frac{9}{-9}
Divide both sides by -9.
x=-1
Divide 9 by -9 to get -1.