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13x-90=8x+40
We move all terms to the left:
13x-90-(8x+40)=0
We get rid of parentheses
13x-8x-40-90=0
We add all the numbers together, and all the variables
5x-130=0
We move all terms containing x to the left, all other terms to the right
5x=130
x=130/5
x=26
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