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