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15x-13=4x+8
We move all terms to the left:
15x-13-(4x+8)=0
We get rid of parentheses
15x-4x-8-13=0
We add all the numbers together, and all the variables
11x-21=0
We move all terms containing x to the left, all other terms to the right
11x=21
x=21/11
x=1+10/11
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