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3x-12=2x+8
Multiply both sides of the equation by 4, the least common multiple of 4,2.
3x-12-2x=8
Subtract 2x from both sides.
x-12=8
Combine 3x and -2x to get x.
x=8+12
Add 12 to both sides.
x=20
Add 8 and 12 to get 20.