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88=9u+7
We move all terms to the left:
88-(9u+7)=0
We get rid of parentheses
-9u-7+88=0
We add all the numbers together, and all the variables
-9u+81=0
We move all terms containing u to the left, all other terms to the right
-9u=-81
u=-81/-9
u=+9
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