6x+3x=-12

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Solution for 6x+3x=-12 equation: 



6x+3x=-12

We move all terms to the left:

6x+3x-(-12)=0

We add all the numbers together, and all the variables

9x+12=0

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

9x=-12

x=-12/9

x=-1+1/3

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