9x+3=-12x-3

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



9x+3=-12x-3

We move all terms to the left:

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

We get rid of parentheses

9x+12x+3+3=0

We add all the numbers together, and all the variables

21x+6=0

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

21x=-6

x=-6/21

x=-2/7

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