L=(R-r)(R+3r)3.1425/1

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Solution for L=(R-r)(R+3r)3.1425/1 equation: 



=(-L)(+3L)3.1425/1

We move all terms to the left:

-((-L)(+3L)3.1425/1)=0

We add all the numbers together, and all the variables

-((-1L)(+3L)3.1425/1)=0

We multiply parentheses ..

-((-3L^2)3.1425/1)=0

We multiply all the terms by the denominator


-((-3L^2)3.1425=0

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