X+15=-2x

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Solution for X+15=-2x equation: 



X+15=-2X

We move all terms to the left:

X+15-(-2X)=0

We get rid of parentheses

X+2X+15=0

We add all the numbers together, and all the variables

3X+15=0

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

3X=-15

X=-15/3

X=-5

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