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23=u/3-12
We move all terms to the left:
23-(u/3-12)=0
We get rid of parentheses
-u/3+12+23=0
We multiply all the terms by the denominator
-u+12*3+23*3=0
We add all the numbers together, and all the variables
-1u+105=0
We move all terms containing u to the left, all other terms to the right
-u=-105
u=-105/-1
u=+105
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