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r in (-oo:+oo)
61/4 = r/5 // - r/5
61/4-(r/5) = 0
61/4-1/5*r = 0 // - 61/4
-1/5*r = -61/4 // : -1/5
r = -61/4/(-1/5)
r = 305/4
r = 305/4
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