480=3.14r^2*8

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Solution for 480=3.14r^2*8 equation: 



480=3.14r^2*8

We move all terms to the left:

480-(3.14r^2*8)=0

We get rid of parentheses

-3.14r^2*8+480=0

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

-3.14r^2*8=-480

r=-480/1

r=-480

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