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