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(5x+5)+(9x-8)=81
We move all terms to the left:
(5x+5)+(9x-8)-(81)=0
We get rid of parentheses
5x+9x+5-8-81=0
We add all the numbers together, and all the variables
14x-84=0
We move all terms containing x to the left, all other terms to the right
14x=84
x=84/14
x=6
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