-9-4u=-u

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Solution for -9-4u=-u equation: 



-9-4u=-u

We move all terms to the left:

-9-4u-(-u)=0

We add all the numbers together, and all the variables

-4u-(-1u)-9=0

We get rid of parentheses

-4u+1u-9=0

We add all the numbers together, and all the variables

-3u-9=0

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

-3u=9

u=9/-3

u=-3

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