8-2a=20

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Solution for 8-2a=20 equation: 



8-2a=20

We move all terms to the left:

8-2a-(20)=0

We add all the numbers together, and all the variables

-2a-12=0

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

-2a=12

a=12/-2

a=-6

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