8-4a=20

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Solution for 8-4a=20 equation: 



8-4a=20

We move all terms to the left:

8-4a-(20)=0

We add all the numbers together, and all the variables

-4a-12=0

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

-4a=12

a=12/-4

a=-3

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