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2x+12=x+12-4
We move all terms to the left:
2x+12-(x+12-4)=0
We add all the numbers together, and all the variables
2x-(x+8)+12=0
We get rid of parentheses
2x-x-8+12=0
We add all the numbers together, and all the variables
x+4=0
We move all terms containing x to the left, all other terms to the right
x=-4
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