2a+20=a+3a

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Solution for 2a+20=a+3a equation: 



2a+20=a+3a

We move all terms to the left:

2a+20-(a+3a)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

2a-4a+20=0

We add all the numbers together, and all the variables

-2a+20=0

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

-2a=-20

a=-20/-2

a=+10

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