A=20+2x

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Solution for A=20+2x equation: 



=20+2A

We move all terms to the left:

-(20+2A)=0

We add all the numbers together, and all the variables

-(2A+20)=0

We get rid of parentheses

-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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