A1=300,d=-21

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Solution for A1=300,d=-21 equation: 



1=300.A=-21

We move all terms to the left:

1-(300.A)=0

We add all the numbers together, and all the variables

-(+300.A)+1=0

We get rid of parentheses

-300.A+1=0

We add all the numbers together, and all the variables

-300A+1=0

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

-300A=-1

A=-1/-300

A=1/300

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