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23=u/2-12
We move all terms to the left:
23-(u/2-12)=0
We get rid of parentheses
-u/2+12+23=0
We multiply all the terms by the denominator
-u+12*2+23*2=0
We add all the numbers together, and all the variables
-1u+70=0
We move all terms containing u to the left, all other terms to the right
-u=-70
u=-70/-1
u=+70
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