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4x-(x+8)=13
We move all terms to the left:
4x-(x+8)-(13)=0
We get rid of parentheses
4x-x-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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