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r in (-oo:+oo)
16/12 = r/18 // - r/18
16/12-(r/18) = 0
4/3-1/18*r = 0 // - 4/3
-1/18*r = -4/3 // : -1/18
r = -4/3/(-1/18)
r = 24
r = 24
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