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84=2x-12
We move all terms to the left:
84-(2x-12)=0
We get rid of parentheses
-2x+12+84=0
We add all the numbers together, and all the variables
-2x+96=0
We move all terms containing x to the left, all other terms to the right
-2x=-96
x=-96/-2
x=+48
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