9=-7+u

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Solution for 9=-7+u equation: 



9=-7+u

We move all terms to the left:

9-(-7+u)=0

We add all the numbers together, and all the variables

-(u-7)+9=0

We get rid of parentheses

-u+7+9=0

We add all the numbers together, and all the variables

-1u+16=0

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

-u=-16

u=-16/-1

u=+16

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