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23=u/4-13
We move all terms to the left:
23-(u/4-13)=0
We get rid of parentheses
-u/4+13+23=0
We multiply all the terms by the denominator
-u+13*4+23*4=0
We add all the numbers together, and all the variables
-1u+144=0
We move all terms containing u to the left, all other terms to the right
-u=-144
u=-144/-1
u=+144
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