1x+9=-1x-9

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



1x+9=-1x-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

x+1x+9+9=0

We add all the numbers together, and all the variables

2x+18=0

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

2x=-18

x=-18/2

x=-9

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