12x-9x+8=-x-20

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Solution for 12x-9x+8=-x-20 equation: 



12x-9x+8=-x-20

We move all terms to the left:

12x-9x+8-(-x-20)=0

We add all the numbers together, and all the variables

12x-9x-(-1x-20)+8=0

We add all the numbers together, and all the variables

3x-(-1x-20)+8=0

We get rid of parentheses

3x+1x+20+8=0

We add all the numbers together, and all the variables

4x+28=0

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

4x=-28

x=-28/4

x=-7

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