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3+u/3=-6
We move all terms to the left:
3+u/3-(-6)=0
We add all the numbers together, and all the variables
u/3+9=0
We multiply all the terms by the denominator
u+9*3=0
We add all the numbers together, and all the variables
u+27=0
We move all terms containing u to the left, all other terms to the right
u=-27
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