-9=15+u/3

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Solution for -9=15+u/3 equation: 



-9=15+u/3

We move all terms to the left:

-9-(15+u/3)=0

We add all the numbers together, and all the variables

-(u/3+15)-9=0

We get rid of parentheses

-u/3-15-9=0

We multiply all the terms by the denominator


-u-15*3-9*3=0

We add all the numbers together, and all the variables

-1u-72=0

We move all terms containing u to the left, all other terms to the right

-u=72

u=72/-1

u=-72

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