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2\left(-x\right)+12+4x-x=2x
Use the distributive property to multiply 2 by -x+6.
2\left(-x\right)+12+3x=2x
Combine 4x and -x to get 3x.
2\left(-x\right)+12+3x-2x=0
Subtract 2x from both sides.
2\left(-x\right)+12+x=0
Combine 3x and -2x to get x.
2\left(-x\right)+x=-12
Subtract 12 from both sides. Anything subtracted from zero gives its negation.
-2x+x=-12
Multiply 2 and -1 to get -2.
-x=-12
Combine -2x and x to get -x.
x=12
Multiply both sides by -1.