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-5-8u=-7u
We move all terms to the left:
-5-8u-(-7u)=0
We get rid of parentheses
-8u+7u-5=0
We add all the numbers together, and all the variables
-1u-5=0
We move all terms containing u to the left, all other terms to the right
-u=5
u=5/-1
u=-5
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