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r in (-oo:+oo)
13/85 = r/100 // - r/100
13/85-(r/100) = 0
13/85-1/100*r = 0 // - 13/85
-1/100*r = -13/85 // : -1/100
r = -13/85/(-1/100)
r = 260/17
r = 260/17
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