3x-9+12x+12=-3x-9

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



3x-9+12x+12=-3x-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

15x-(-3x-9)+3=0

We get rid of parentheses

15x+3x+9+3=0

We add all the numbers together, and all the variables

18x+12=0

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

18x=-12

x=-12/18

x=-2/3

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