2a-4=4a-20

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



2a-4=4a-20

We move all terms to the left:

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

We get rid of parentheses

2a-4a+20-4=0

We add all the numbers together, and all the variables

-2a+16=0

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

-2a=-16

a=-16/-2

a=+8

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