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r in (-oo:+oo)
35/14 = r/22 // - r/22
35/14-(r/22) = 0
5/2-1/22*r = 0 // - 5/2
-1/22*r = -5/2 // : -1/22
r = -5/2/(-1/22)
r = 55
r = 55
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