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81=9(u-88)
We move all terms to the left:
81-(9(u-88))=0
We calculate terms in parentheses: -(9(u-88)), so:We get rid of parentheses
9(u-88)
We multiply parentheses
9u-792
Back to the equation:
-(9u-792)
-9u+792+81=0
We add all the numbers together, and all the variables
-9u+873=0
We move all terms containing u to the left, all other terms to the right
-9u=-873
u=-873/-9
u=+97
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