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18=9(u+2)
We move all terms to the left:
18-(9(u+2))=0
We calculate terms in parentheses: -(9(u+2)), so:We get rid of parentheses
9(u+2)
We multiply parentheses
9u+18
Back to the equation:
-(9u+18)
-9u-18+18=0
We add all the numbers together, and all the variables
-9u=0
u=0/-9
u=0
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