X+9=-1-x

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Solution for X+9=-1-x equation: 



X+9=-1-X

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

X+1X+1+9=0

We add all the numbers together, and all the variables

2X+10=0

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

2X=-10

X=-10/2

X=-5

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