X-3=-15-x

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Solution for X-3=-15-x equation: 



X-3=-15-X

We move all terms to the left:

X-3-(-15-X)=0

We add all the numbers together, and all the variables

X-(-1X-15)-3=0

We get rid of parentheses

X+1X+15-3=0

We add all the numbers together, and all the variables

2X+12=0

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

2X=-12

X=-12/2

X=-6

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