-9-u=-10u

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Solution for -9-u=-10u equation: 



-9-u=-10u

We move all terms to the left:

-9-u-(-10u)=0

We add all the numbers together, and all the variables

-1u-(-10u)-9=0

We get rid of parentheses

-1u+10u-9=0

We add all the numbers together, and all the variables

9u-9=0

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

9u=9

u=9/9

u=1

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