12-x+9=-4x

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Solution for 12-x+9=-4x equation: 



12-x+9=-4x

We move all terms to the left:

12-x+9-(-4x)=0

We add all the numbers together, and all the variables

-1x-(-4x)+21=0

We get rid of parentheses

-1x+4x+21=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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