12x+9=-3x-18

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Solution for 12x+9=-3x-18 equation: 



12x+9=-3x-18

We move all terms to the left:

12x+9-(-3x-18)=0

We get rid of parentheses

12x+3x+18+9=0

We add all the numbers together, and all the variables

15x+27=0

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

15x=-27

x=-27/15

x=-1+4/5

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