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3+u/3=-9
We move all terms to the left:
3+u/3-(-9)=0
We add all the numbers together, and all the variables
u/3+12=0
We multiply all the terms by the denominator
u+12*3=0
We add all the numbers together, and all the variables
u+36=0
We move all terms containing u to the left, all other terms to the right
u=-36
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