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27=6u+3u
We move all terms to the left:
27-(6u+3u)=0
We add all the numbers together, and all the variables
-(+9u)+27=0
We get rid of parentheses
-9u+27=0
We move all terms containing u to the left, all other terms to the right
-9u=-27
u=-27/-9
u=+3
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