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3x+4-x=-12
Subtract x from both sides.
2x+4=-12
Combine 3x and -x to get 2x.
2x=-12-4
Subtract 4 from both sides.
2x=-16
Subtract 4 from -12 to get -16.
x=\frac{-16}{2}
Divide both sides by 2.
x=-8
Divide -16 by 2 to get -8.