12+3x=-9-4x

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Solution for 12+3x=-9-4x equation: 



12+3x=-9-4x

We move all terms to the left:

12+3x-(-9-4x)=0

We add all the numbers together, and all the variables

3x-(-4x-9)+12=0

We get rid of parentheses

3x+4x+9+12=0

We add all the numbers together, and all the variables

7x+21=0

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

7x=-21

x=-21/7

x=-3

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