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-u/9=-39
We move all terms to the left:
-u/9-(-39)=0
We add all the numbers together, and all the variables
-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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