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r in (-oo:+oo)
(5/6)*r = 4/35 // - 4/35
(5/6)*r-(4/35) = 0
(5/6)*r-4/35 = 0
5/6*r-4/35 = 0 // + 4/35
5/6*r = 4/35 // : 5/6
r = 4/35/5/6
r = 24/175
r = 24/175
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