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r in (-oo:+oo)
5/3 = r/9 // - r/9
5/3-(r/9) = 0
5/3-1/9*r = 0 // - 5/3
-1/9*r = -5/3 // : -1/9
r = -5/3/(-1/9)
r = 15
r = 15
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