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

-(-1u+7)+9=0

We get rid of parentheses

1u-7+9=0

We add all the numbers together, and all the variables

u+2=0

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

u=-2

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