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r in (-oo:+oo)
3/20 = r/100 // - r/100
3/20-(r/100) = 0
3/20-1/100*r = 0 // - 3/20
-1/100*r = -3/20 // : -1/100
r = -3/20/(-1/100)
r = 15
r = 15
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