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12-4x+6x=20
Add 6x to both sides.
12+2x=20
Combine -4x and 6x to get 2x.
2x=20-12
Subtract 12 from both sides.
2x=8
Subtract 12 from 20 to get 8.
x=\frac{8}{2}
Divide both sides by 2.
x=4
Divide 8 by 2 to get 4.