9-u=-1

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Solution for 9-u=-1 equation: 



9-u=-1

We move all terms to the left:

9-u-(-1)=0

We add all the numbers together, and all the variables

-1u+10=0

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

-u=-10

u=-10/-1

u=+10

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