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20x-81=-17x+6
We move all terms to the left:
20x-81-(-17x+6)=0
We get rid of parentheses
20x+17x-6-81=0
We add all the numbers together, and all the variables
37x-87=0
We move all terms containing x to the left, all other terms to the right
37x=87
x=87/37
x=2+13/37
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