9+x=-2x

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Solution for 9+x=-2x equation: 



9+x=-2x

We move all terms to the left:

9+x-(-2x)=0

We get rid of parentheses

x+2x+9=0

We add all the numbers together, and all the variables

3x+9=0

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

3x=-9

x=-9/3

x=-3

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