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-3=3+u/3
We move all terms to the left:
-3-(3+u/3)=0
We add all the numbers together, and all the variables
-(u/3+3)-3=0
We get rid of parentheses
-u/3-3-3=0
We multiply all the terms by the denominator
-u-3*3-3*3=0
We add all the numbers together, and all the variables
-1u-18=0
We move all terms containing u to the left, all other terms to the right
-u=18
u=18/-1
u=-18
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