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20x-31=76x+77
We move all terms to the left:
20x-31-(76x+77)=0
We get rid of parentheses
20x-76x-77-31=0
We add all the numbers together, and all the variables
-56x-108=0
We move all terms containing x to the left, all other terms to the right
-56x=108
x=108/-56
x=-1+13/14
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