X+9=-x-3

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Solution for X+9=-x-3 equation: 



X+9=-X-3

We move all terms to the left:

X+9-(-X-3)=0

We add all the numbers together, and all the variables

X-(-1X-3)+9=0

We get rid of parentheses

X+1X+3+9=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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