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r in (-oo:+oo)
46/73 = r/100 // - r/100
46/73-(r/100) = 0
46/73-1/100*r = 0 // - 46/73
-1/100*r = -46/73 // : -1/100
r = -46/73/(-1/100)
r = 4600/73
r = 4600/73
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