A1=-18+20n

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Solution for A1=-18+20n equation: 



1=-18+20A

We move all terms to the left:

1-(-18+20A)=0

We add all the numbers together, and all the variables

-(20A-18)+1=0

We get rid of parentheses

-20A+18+1=0

We add all the numbers together, and all the variables

-20A+19=0

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

-20A=-19

A=-19/-20

A=19/20

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