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81=64x-8x
We move all terms to the left:
81-(64x-8x)=0
We add all the numbers together, and all the variables
-(+56x)+81=0
We get rid of parentheses
-56x+81=0
We move all terms containing x to the left, all other terms to the right
-56x=-81
x=-81/-56
x=1+25/56
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