A=20-2n

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Solution for A=20-2n 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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