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r in (-oo:+oo)
-1/10 = r/10 // - r/10
-(r/10)-1/10 = 0
-1/10*r-1/10 = 0 // + 1/10
-1/10*r = 1/10 // : -1/10
r = 1/10/(-1/10)
r = -1
r = -1
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