-15=-9+-3u

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Solution for -15=-9+-3u equation: 



-15=-9+-3u

We move all terms to the left:

-15-(-9+-3u)=0

We add all the numbers together, and all the variables

-(-3u)-15=0

We get rid of parentheses

3u-15=0

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

3u=15

u=15/3

u=5

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