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r in (-oo:+oo)
24/18 = r/3 // - r/3
24/18-(r/3) = 0
4/3-1/3*r = 0 // - 4/3
-1/3*r = -4/3 // : -1/3
r = -4/3/(-1/3)
r = 4
r = 4
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