21=3.14(4)^2r/3

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Solution for 21=3.14(4)^2r/3 equation: 



21=3.14(4)^2r/3

We move all terms to the left:

21-(3.14(4)^2r/3)=0

We get rid of parentheses

-3.144^2r/3+21=0

We multiply all the terms by the denominator


-3.144^2r+21*3=0

We add all the numbers together, and all the variables

-3.144^2r+63=0

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

-3.144^2r=-63

r=-63/1

r=-63

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