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r in (-oo:+oo)
(5/6)*r = 4*(3/5) // - 4*(3/5)
(5/6)*r-(4*(3/5)) = 0
(5/6)*r-12/5 = 0
5/6*r-12/5 = 0 // + 12/5
5/6*r = 12/5 // : 5/6
r = 12/5/5/6
r = 72/25
r = 72/25
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