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11x-13=8x+8
We move all terms to the left:
11x-13-(8x+8)=0
We get rid of parentheses
11x-8x-8-13=0
We add all the numbers together, and all the variables
3x-21=0
We move all terms containing x to the left, all other terms to the right
3x=21
x=21/3
x=7
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