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9=3(u-1)
We move all terms to the left:
9-(3(u-1))=0
We calculate terms in parentheses: -(3(u-1)), so:We get rid of parentheses
3(u-1)
We multiply parentheses
3u-3
Back to the equation:
-(3u-3)
-3u+3+9=0
We add all the numbers together, and all the variables
-3u+12=0
We move all terms containing u to the left, all other terms to the right
-3u=-12
u=-12/-3
u=+4
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