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-80=7u-17
We move all terms to the left:
-80-(7u-17)=0
We get rid of parentheses
-7u+17-80=0
We add all the numbers together, and all the variables
-7u-63=0
We move all terms containing u to the left, all other terms to the right
-7u=63
u=63/-7
u=-9
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