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r in (-oo:+oo)
3/5 = r/25 // - r/25
3/5-(r/25) = 0
3/5-1/25*r = 0 // - 3/5
-1/25*r = -3/5 // : -1/25
r = -3/5/(-1/25)
r = 15
r = 15
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