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(13x+36)=81
We move all terms to the left:
(13x+36)-(81)=0
We get rid of parentheses
13x+36-81=0
We add all the numbers together, and all the variables
13x-45=0
We move all terms containing x to the left, all other terms to the right
13x=45
x=45/13
x=3+6/13
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