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4x+12=3x-12
Multiply both sides of the equation by 12, the least common multiple of 3,4.
4x+12-3x=-12
Subtract 3x from both sides.
x+12=-12
Combine 4x and -3x to get x.
x=-12-12
Subtract 12 from both sides.
x=-24
Subtract 12 from -12 to get -24.