9a+3a=-1

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Solution for 9a+3a=-1 equation: 



9a+3a=-1

We move all terms to the left:

9a+3a-(-1)=0

We add all the numbers together, and all the variables

12a+1=0

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

12a=-1

a=-1/12

a=-1/12

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