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64=8(u-84)
We move all terms to the left:
64-(8(u-84))=0
We calculate terms in parentheses: -(8(u-84)), so:We get rid of parentheses
8(u-84)
We multiply parentheses
8u-672
Back to the equation:
-(8u-672)
-8u+672+64=0
We add all the numbers together, and all the variables
-8u+736=0
We move all terms containing u to the left, all other terms to the right
-8u=-736
u=-736/-8
u=+92
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