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81=4x+17
We move all terms to the left:
81-(4x+17)=0
We get rid of parentheses
-4x-17+81=0
We add all the numbers together, and all the variables
-4x+64=0
We move all terms containing x to the left, all other terms to the right
-4x=-64
x=-64/-4
x=+16
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