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r in (-oo:+oo)
3/5 = r/35 // - r/35
3/5-(r/35) = 0
3/5-1/35*r = 0 // - 3/5
-1/35*r = -3/5 // : -1/35
r = -3/5/(-1/35)
r = 21
r = 21
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