-6=9+u

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Solution for -6=9+u equation: 



-6=9+u

We move all terms to the left:

-6-(9+u)=0

We add all the numbers together, and all the variables

-(u+9)-6=0

We get rid of parentheses

-u-9-6=0

We add all the numbers together, and all the variables

-1u-15=0

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

-u=15

u=15/-1

u=-15

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