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20=12x-64
We move all terms to the left:
20-(12x-64)=0
We get rid of parentheses
-12x+64+20=0
We add all the numbers together, and all the variables
-12x+84=0
We move all terms containing x to the left, all other terms to the right
-12x=-84
x=-84/-12
x=+7
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