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r in (-oo:+oo)
5/3 = r/12 // - r/12
5/3-(r/12) = 0
5/3-1/12*r = 0 // - 5/3
-1/12*r = -5/3 // : -1/12
r = -5/3/(-1/12)
r = 20
r = 20
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