-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+3=0

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

-u=-3

u=-3/-1

u=+3

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