9=-u

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Solution for 9=-u equation: 



9=-u

We move all terms to the left:

9-(-u)=0

We add all the numbers together, and all the variables

-(-1u)+9=0

We get rid of parentheses

1u+9=0

We add all the numbers together, and all the variables

u+9=0

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

u=-9

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