-9=-5+u

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Solution for -9=-5+u equation: 



-9=-5+u

We move all terms to the left:

-9-(-5+u)=0

We add all the numbers together, and all the variables

-(u-5)-9=0

We get rid of parentheses

-u+5-9=0

We add all the numbers together, and all the variables

-1u-4=0

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

-u=4

u=4/-1

u=-4

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