4/9=r3/45

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Solution for 4/9=r3/45 equation: 


r in (-oo:+oo)

4/9 = (r^3)/45 // - (r^3)/45

4/9-((r^3)/45) = 0

-1/45*r^3 = -4/9 // : -1/45

r^3 = 20

r^3 = 20 // ^ 1/3

r = 20^(1/3)

r = 20^(1/3)

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