9+3a=-6

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Solution for 9+3a=-6 equation: 



9+3a=-6

We move all terms to the left:

9+3a-(-6)=0

We add all the numbers together, and all the variables

3a+15=0

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

3a=-15

a=-15/3

a=-5

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