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w+80=8w-91
We move all terms to the left:
w+80-(8w-91)=0
We get rid of parentheses
w-8w+91+80=0
We add all the numbers together, and all the variables
-7w+171=0
We move all terms containing w to the left, all other terms to the right
-7w=-171
w=-171/-7
w=24+3/7
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