-3=3u-9

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Solution for -3=3u-9 equation: 



-3=3u-9

We move all terms to the left:

-3-(3u-9)=0

We get rid of parentheses

-3u+9-3=0

We add all the numbers together, and all the variables

-3u+6=0

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

-3u=-6

u=-6/-3

u=+2

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