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r in (-oo:+oo)
(5*r)/9 = 6/5 // - 6/5
(5*r)/9-(6/5) = 0
(5*r)/9-6/5 = 0
5/9*r-6/5 = 0 // + 6/5
5/9*r = 6/5 // : 5/9
r = 6/5/5/9
r = 54/25
r = 54/25
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