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64=8u+8
We move all terms to the left:
64-(8u+8)=0
We get rid of parentheses
-8u-8+64=0
We add all the numbers together, and all the variables
-8u+56=0
We move all terms containing u to the left, all other terms to the right
-8u=-56
u=-56/-8
u=+7
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