u+9=-2u-9

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Solution for u+9=-2u-9 equation: 



u+9=-2u-9

We move all terms to the left:

u+9-(-2u-9)=0

We get rid of parentheses

u+2u+9+9=0

We add all the numbers together, and all the variables

3u+18=0

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

3u=-18

u=-18/3

u=-6

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