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4x+12=2x-4x-12
We move all terms to the left:
4x+12-(2x-4x-12)=0
We add all the numbers together, and all the variables
4x-(-2x-12)+12=0
We get rid of parentheses
4x+2x+12+12=0
We add all the numbers together, and all the variables
6x+24=0
We move all terms containing x to the left, all other terms to the right
6x=-24
x=-24/6
x=-4
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