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5w-7=10w-87
We move all terms to the left:
5w-7-(10w-87)=0
We get rid of parentheses
5w-10w+87-7=0
We add all the numbers together, and all the variables
-5w+80=0
We move all terms containing w to the left, all other terms to the right
-5w=-80
w=-80/-5
w=+16
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