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r in (-oo:+oo)
(5/6)*r = 3/10 // - 3/10
(5/6)*r-(3/10) = 0
(5/6)*r-3/10 = 0
5/6*r-3/10 = 0 // + 3/10
5/6*r = 3/10 // : 5/6
r = 3/10/5/6
r = 9/25
r = 9/25
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