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3=u/23
We move all terms to the left:
3-(u/23)=0
We add all the numbers together, and all the variables
-(+u/23)+3=0
We get rid of parentheses
-u/23+3=0
We multiply all the terms by the denominator
-u+3*23=0
We add all the numbers together, and all the variables
-1u+69=0
We move all terms containing u to the left, all other terms to the right
-u=-69
u=-69/-1
u=+69
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