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-u/9=39
We move all terms to the left:
-u/9-(39)=0
We multiply all the terms by the denominator
-u-39*9=0
We add all the numbers together, and all the variables
-1u-351=0
We move all terms containing u to the left, all other terms to the right
-u=351
u=351/-1
u=-351
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