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3=u/3-1
We move all terms to the left:
3-(u/3-1)=0
We get rid of parentheses
-u/3+1+3=0
We multiply all the terms by the denominator
-u+1*3+3*3=0
We add all the numbers together, and all the variables
-1u+12=0
We move all terms containing u to the left, all other terms to the right
-u=-12
u=-12/-1
u=+12
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