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2x+(2x+12)=84
We move all terms to the left:
2x+(2x+12)-(84)=0
We get rid of parentheses
2x+2x+12-84=0
We add all the numbers together, and all the variables
4x-72=0
We move all terms containing x to the left, all other terms to the right
4x=72
x=72/4
x=18
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