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-71=8u-7
We move all terms to the left:
-71-(8u-7)=0
We get rid of parentheses
-8u+7-71=0
We add all the numbers together, and all the variables
-8u-64=0
We move all terms containing u to the left, all other terms to the right
-8u=64
u=64/-8
u=-8
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