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r in (-oo:+oo)
5/12 = r/24 // - r/24
5/12-(r/24) = 0
5/12-1/24*r = 0 // - 5/12
-1/24*r = -5/12 // : -1/24
r = -5/12/(-1/24)
r = 10
r = 10
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