20-4a=8

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Solution for 20-4a=8 equation: 



20-4a=8

We move all terms to the left:

20-4a-(8)=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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