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r in (-oo:+oo)
(2*r)/5-(3/5) = 11/5 // - 11/5
(2*r)/5-(3/5)-(11/5) = 0
(2*r)/5-3/5-11/5 = 0
2/5*r-14/5 = 0 // + 14/5
2/5*r = 14/5 // : 2/5
r = 14/5/2/5
r = 7
r = 7
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