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23=u/2-11
We move all terms to the left:
23-(u/2-11)=0
We get rid of parentheses
-u/2+11+23=0
We multiply all the terms by the denominator
-u+11*2+23*2=0
We add all the numbers together, and all the variables
-1u+68=0
We move all terms containing u to the left, all other terms to the right
-u=-68
u=-68/-1
u=+68
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