9-4a=-31

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Solution for 9-4a=-31 equation: 



9-4a=-31

We move all terms to the left:

9-4a-(-31)=0

We add all the numbers together, and all the variables

-4a+40=0

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

-4a=-40

a=-40/-4

a=+10

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