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u/9=-28
We move all terms to the left:
u/9-(-28)=0
We add all the numbers together, and all the variables
u/9+28=0
We multiply all the terms by the denominator
u+28*9=0
We add all the numbers together, and all the variables
u+252=0
We move all terms containing u to the left, all other terms to the right
u=-252
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