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x+12+x+12=4x-16
We move all terms to the left:
x+12+x+12-(4x-16)=0
We add all the numbers together, and all the variables
2x-(4x-16)+24=0
We get rid of parentheses
2x-4x+16+24=0
We add all the numbers together, and all the variables
-2x+40=0
We move all terms containing x to the left, all other terms to the right
-2x=-40
x=-40/-2
x=+20
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