-9=u+7

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Solution for -9=u+7 equation: 



-9=u+7

We move all terms to the left:

-9-(u+7)=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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