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84=6x-12
We move all terms to the left:
84-(6x-12)=0
We get rid of parentheses
-6x+12+84=0
We add all the numbers together, and all the variables
-6x+96=0
We move all terms containing x to the left, all other terms to the right
-6x=-96
x=-96/-6
x=+16
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