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r in (-oo:+oo)
3/4 = r/6 // - r/6
3/4-(r/6) = 0
3/4-1/6*r = 0 // - 3/4
-1/6*r = -3/4 // : -1/6
r = -3/4/(-1/6)
r = 9/2
r = 9/2
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