-3.1+9a=-0.4

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Solution for -3.1+9a=-0.4 equation: 



-3.1+9a=-0.4

We move all terms to the left:

-3.1+9a-(-0.4)=0

We add all the numbers together, and all the variables

9a-2.7=0

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

9a=2.7

a=2.7/9

a=2.7/9

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