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r in (-oo:+oo)
(1.25*r)/7 = 2.5 // - 2.5
(1.25*r)/7-2.5 = 0
0.17857143*r-2.5 = 0 // + 2.5
0.17857143*r = 2.5 // : 0.17857143
r = 2.5/0.17857143
r = 13.99999989
r = 13.99999989
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