9+8a=-31

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Solution for 9+8a=-31 equation: 



9+8a=-31

We move all terms to the left:

9+8a-(-31)=0

We add all the numbers together, and all the variables

8a+40=0

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

8a=-40

a=-40/8

a=-5

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