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r in (-oo:+oo)
6/8 = r/10 // - r/10
6/8-(r/10) = 0
3/4-1/10*r = 0 // - 3/4
-1/10*r = -3/4 // : -1/10
r = -3/4/(-1/10)
r = 15/2
r = 15/2
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