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r in (-oo:+oo)
-3/5 = r/5 // - r/5
-(r/5)-3/5 = 0
-1/5*r-3/5 = 0 // + 3/5
-1/5*r = 3/5 // : -1/5
r = 3/5/(-1/5)
r = -3
r = -3
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