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r in (-oo:+oo)
8/5 = r/15 // - r/15
8/5-(r/15) = 0
8/5-1/15*r = 0 // - 8/5
-1/15*r = -8/5 // : -1/15
r = -8/5/(-1/15)
r = 24
r = 24
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