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r in (-oo:+oo)
3/5 = r/13 // - r/13
3/5-(r/13) = 0
3/5-1/13*r = 0 // - 3/5
-1/13*r = -3/5 // : -1/13
r = -3/5/(-1/13)
r = 39/5
r = 39/5
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