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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