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r in (-oo:+oo)
-8/68 = r/100 // - r/100
-(r/100)-8/68 = 0
-1/100*r-2/17 = 0 // + 2/17
-1/100*r = 2/17 // : -1/100
r = 2/17/(-1/100)
r = -200/17
r = -200/17
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