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r in (-oo:+oo)
(5/9)*r = 71/2 // - 71/2
(5/9)*r-(71/2) = 0
(5/9)*r-71/2 = 0
5/9*r-71/2 = 0 // + 71/2
5/9*r = 71/2 // : 5/9
r = 71/2/5/9
r = 639/10
r = 639/10
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