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15x-71=17x-87
We move all terms to the left:
15x-71-(17x-87)=0
We get rid of parentheses
15x-17x+87-71=0
We add all the numbers together, and all the variables
-2x+16=0
We move all terms containing x to the left, all other terms to the right
-2x=-16
x=-16/-2
x=+8
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