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23=u/2-13
We move all terms to the left:
23-(u/2-13)=0
We get rid of parentheses
-u/2+13+23=0
We multiply all the terms by the denominator
-u+13*2+23*2=0
We add all the numbers together, and all the variables
-1u+72=0
We move all terms containing u to the left, all other terms to the right
-u=-72
u=-72/-1
u=+72
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