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6u-21=(9u+1)
We move all terms to the left:
6u-21-((9u+1))=0
We calculate terms in parentheses: -((9u+1)), so:We get rid of parentheses
(9u+1)
We get rid of parentheses
9u+1
Back to the equation:
-(9u+1)
6u-9u-1-21=0
We add all the numbers together, and all the variables
-3u-22=0
We move all terms containing u to the left, all other terms to the right
-3u=22
u=22/-3
u=-7+1/3
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