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r in (-oo:+oo)
(14*r^5)/7 = 25 // - 25
(14*r^5)/7-25 = 0
2*r^5 = 25 // : 2
r^5 = 25/2
r^5 = 25/2 // ^ 1/5
r = (25/2)^(1/5)
r = (25/2)^(1/5)
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