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-7=w/8+3
We move all terms to the left:
-7-(w/8+3)=0
We get rid of parentheses
-w/8-3-7=0
We multiply all the terms by the denominator
-w-3*8-7*8=0
We add all the numbers together, and all the variables
-1w-80=0
We move all terms containing w to the left, all other terms to the right
-w=80
w=80/-1
w=-80
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