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23=u/4+7
We move all terms to the left:
23-(u/4+7)=0
We get rid of parentheses
-u/4-7+23=0
We multiply all the terms by the denominator
-u-7*4+23*4=0
We add all the numbers together, and all the variables
-1u+64=0
We move all terms containing u to the left, all other terms to the right
-u=-64
u=-64/-1
u=+64
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