A20,A1=-20,d=-4

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Solution for A20,A1=-20,d=-4 equation: 



20.1=-20.A=-4

We move all terms to the left:

20.1-(-20.A)=0

We add all the numbers together, and all the variables

-(-20A)+20.1=0

We get rid of parentheses

20A+20.1=0

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

20A=-20.1

A=-20.1/20

A=-1+0.1/20

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