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(5x-4)=81
We move all terms to the left:
(5x-4)-(81)=0
We get rid of parentheses
5x-4-81=0
We add all the numbers together, and all the variables
5x-85=0
We move all terms containing x to the left, all other terms to the right
5x=85
x=85/5
x=17
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