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-23=3+9-11u
We move all terms to the left:
-23-(3+9-11u)=0
We add all the numbers together, and all the variables
-(-11u+12)-23=0
We get rid of parentheses
11u-12-23=0
We add all the numbers together, and all the variables
11u-35=0
We move all terms containing u to the left, all other terms to the right
11u=35
u=35/11
u=3+2/11
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