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r in (-oo:+oo)
35/42 = r/6 // - r/6
35/42-(r/6) = 0
5/6-1/6*r = 0 // - 5/6
-1/6*r = -5/6 // : -1/6
r = -5/6/(-1/6)
r = 5
r = 5
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