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u/3+3=-3
We move all terms to the left:
u/3+3-(-3)=0
We add all the numbers together, and all the variables
u/3+6=0
We multiply all the terms by the denominator
u+6*3=0
We add all the numbers together, and all the variables
u+18=0
We move all terms containing u to the left, all other terms to the right
u=-18
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