9x=-3x-12

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



9x=-3x-12

We move all terms to the left:

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

We get rid of parentheses

9x+3x+12=0

We add all the numbers together, and all the variables

12x+12=0

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

12x=-12

x=-12/12

x=-1

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