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(8x+5)+(5x-4)=131
We move all terms to the left:
(8x+5)+(5x-4)-(131)=0
We get rid of parentheses
8x+5x+5-4-131=0
We add all the numbers together, and all the variables
13x-130=0
We move all terms containing x to the left, all other terms to the right
13x=130
x=130/13
x=10
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