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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+6=0
We move all terms containing u to the left, all other terms to the right
-u=-6
u=-6/-1
u=+6
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