2x+12=-x-9

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Solution for 2x+12=-x-9 equation: 



2x+12=-x-9

We move all terms to the left:

2x+12-(-x-9)=0

We add all the numbers together, and all the variables

2x-(-1x-9)+12=0

We get rid of parentheses

2x+1x+9+12=0

We add all the numbers together, and all the variables

3x+21=0

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

3x=-21

x=-21/3

x=-7

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