-9=u-3

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Solution for -9=u-3 equation: 



-9=u-3

We move all terms to the left:

-9-(u-3)=0

We get rid of parentheses

-u+3-9=0

We add all the numbers together, and all the variables

-1u-6=0

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

-u=6

u=6/-1

u=-6

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