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23=u/3+15
We move all terms to the left:
23-(u/3+15)=0
We get rid of parentheses
-u/3-15+23=0
We multiply all the terms by the denominator
-u-15*3+23*3=0
We add all the numbers together, and all the variables
-1u+24=0
We move all terms containing u to the left, all other terms to the right
-u=-24
u=-24/-1
u=+24
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