A=3.14*r*r

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Solution for A=3.14*r*r equation: 



=3.14*A*A

We move all terms to the left:

-(3.14*A*A)=0

We add all the numbers together, and all the variables

-(+3.14*A*A)=0

We get rid of parentheses

-3.14*A*A=0

A=0/1

A=0

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