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72=8(u-89)
We move all terms to the left:
72-(8(u-89))=0
We calculate terms in parentheses: -(8(u-89)), so:We get rid of parentheses
8(u-89)
We multiply parentheses
8u-712
Back to the equation:
-(8u-712)
-8u+712+72=0
We add all the numbers together, and all the variables
-8u+784=0
We move all terms containing u to the left, all other terms to the right
-8u=-784
u=-784/-8
u=+98
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