9=-3u+15

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Solution for 9=-3u+15 equation: 



9=-3u+15

We move all terms to the left:

9-(-3u+15)=0

We get rid of parentheses

3u-15+9=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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