144=3.14r^2*9

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Solution for 144=3.14r^2*9 equation: 



144=3.14r^2*9

We move all terms to the left:

144-(3.14r^2*9)=0

We get rid of parentheses

-3.14r^2*9+144=0

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

-3.14r^2*9=-144

r=-144/1

r=-144

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