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