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-x+3x+2=12
Swap sides so that all variable terms are on the left hand side.
-x+3x=12-2
Subtract 2 from both sides.
-x+3x=10
Subtract 2 from 12 to get 10.
2x=10
Combine -x and 3x to get 2x.
x=\frac{10}{2}
Divide both sides by 2.
x=5
Divide 10 by 2 to get 5.