2a-8+4a=-20

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Solution for 2a-8+4a=-20 equation: 



2a-8+4a=-20

We move all terms to the left:

2a-8+4a-(-20)=0

We add all the numbers together, and all the variables

6a+12=0

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

6a=-12

a=-12/6

a=-2

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