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3u-27=-3(u-1)
We move all terms to the left:
3u-27-(-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+3u-3-27=0
We add all the numbers together, and all the variables
6u-30=0
We move all terms containing u to the left, all other terms to the right
6u=30
u=30/6
u=5
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