-7=-9+u

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Solution for -7=-9+u equation: 



-7=-9+u

We move all terms to the left:

-7-(-9+u)=0

We add all the numbers together, and all the variables

-(u-9)-7=0

We get rid of parentheses

-u+9-7=0

We add all the numbers together, and all the variables

-1u+2=0

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

-u=-2

u=-2/-1

u=+2

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