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r in (-oo:+oo)
742/318 = r/3 // - r/3
742/318-(r/3) = 0
7/3-1/3*r = 0 // - 7/3
-1/3*r = -7/3 // : -1/3
r = -7/3/(-1/3)
r = 7
r = 7
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