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r in (-oo:+oo)
6/30 = r/10 // - r/10
6/30-(r/10) = 0
1/5-1/10*r = 0 // - 1/5
-1/10*r = -1/5 // : -1/10
r = -1/5/(-1/10)
r = 2
r = 2
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