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r in (-oo:+oo)
(5*r)/4 = 45/2 // - 45/2
(5*r)/4-(45/2) = 0
(5*r)/4-45/2 = 0
5/4*r-45/2 = 0 // + 45/2
5/4*r = 45/2 // : 5/4
r = 45/2/5/4
r = 18
r = 18
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