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15x-85=8x-43
We move all terms to the left:
15x-85-(8x-43)=0
We get rid of parentheses
15x-8x+43-85=0
We add all the numbers together, and all the variables
7x-42=0
We move all terms containing x to the left, all other terms to the right
7x=42
x=42/7
x=6
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