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x+12=2-3x
Multiply both sides of the equation by 3.
x+12+3x=2
Add 3x to both sides.
4x+12=2
Combine x and 3x to get 4x.
4x=2-12
Subtract 12 from both sides.
4x=-10
Subtract 12 from 2 to get -10.
x=\frac{-10}{4}
Divide both sides by 4.
x=-\frac{5}{2}
Reduce the fraction \frac{-10}{4} to lowest terms by extracting and canceling out 2.