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u/(-3)-12=(-3)
We move all terms to the left:
u/(-3)-12-((-3))=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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