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89=11+3u
We move all terms to the left:
89-(11+3u)=0
We add all the numbers together, and all the variables
-(3u+11)+89=0
We get rid of parentheses
-3u-11+89=0
We add all the numbers together, and all the variables
-3u+78=0
We move all terms containing u to the left, all other terms to the right
-3u=-78
u=-78/-3
u=+26
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