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8x+13=4x+81
We move all terms to the left:
8x+13-(4x+81)=0
We get rid of parentheses
8x-4x-81+13=0
We add all the numbers together, and all the variables
4x-68=0
We move all terms containing x to the left, all other terms to the right
4x=68
x=68/4
x=17
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