A=100-20n

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Solution for A=100-20n equation: 



=100-20A

We move all terms to the left:

-(100-20A)=0

We add all the numbers together, and all the variables

-(-20A+100)=0

We get rid of parentheses

20A-100=0

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

20A=100

A=100/20

A=5

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