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15x-43=8x+13
We move all terms to the left:
15x-43-(8x+13)=0
We get rid of parentheses
15x-8x-13-43=0
We add all the numbers together, and all the variables
7x-56=0
We move all terms containing x to the left, all other terms to the right
7x=56
x=56/7
x=8
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