X+x+x=-15

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Solution for X+x+x=-15 equation: 



X+X+X=-15

We move all terms to the left:

X+X+X-(-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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