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27=3u+6
We move all terms to the left:
27-(3u+6)=0
We get rid of parentheses
-3u-6+27=0
We add all the numbers together, and all the variables
-3u+21=0
We move all terms containing u to the left, all other terms to the right
-3u=-21
u=-21/-3
u=+7
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