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r in (-oo:+oo)
14/11 = r/100 // - r/100
14/11-(r/100) = 0
14/11-1/100*r = 0 // - 14/11
-1/100*r = -14/11 // : -1/100
r = -14/11/(-1/100)
r = 1400/11
r = 1400/11
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