-9-3u=-4u

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Solution for -9-3u=-4u equation: 



-9-3u=-4u

We move all terms to the left:

-9-3u-(-4u)=0

We get rid of parentheses

-3u+4u-9=0

We add all the numbers together, and all the variables

u-9=0

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

u=9

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