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r in (-oo:+oo)
(5/6)*r = 2/3 // - 2/3
(5/6)*r-(2/3) = 0
(5/6)*r-2/3 = 0
5/6*r-2/3 = 0 // + 2/3
5/6*r = 2/3 // : 5/6
r = 2/3/5/6
r = 4/5
r = 4/5
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