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27=8u-5u
We move all terms to the left:
27-(8u-5u)=0
We add all the numbers together, and all the variables
-(+3u)+27=0
We get rid of parentheses
-3u+27=0
We move all terms containing u to the left, all other terms to the right
-3u=-27
u=-27/-3
u=+9
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