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r in (-oo:+oo)
(4*r)/3 = 4*r-40 // - 4*r-40
(4*r)/3-(4*r)+40 = 0
(4*r)/3-4*r+40 = 0
40-8/3*r = 0 // - 40
-8/3*r = -40 // : -8/3
r = -40/(-8/3)
r = 15
r = 15
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