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8x-91=2x-13
We move all terms to the left:
8x-91-(2x-13)=0
We get rid of parentheses
8x-2x+13-91=0
We add all the numbers together, and all the variables
6x-78=0
We move all terms containing x to the left, all other terms to the right
6x=78
x=78/6
x=13
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