-3x+-9x=-12

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



-3x+-9x=-12

We move all terms to the left:

-3x+-9x-(-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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