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r in (-oo:+oo)
9/24 = r/48 // - r/48
9/24-(r/48) = 0
3/8-1/48*r = 0 // - 3/8
-1/48*r = -3/8 // : -1/48
r = -3/8/(-1/48)
r = 18
r = 18
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