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r in (-oo:+oo)
6*r-(3/6) = r/2 // - r/2
6*r-(r/2)-(3/6) = 0
6*r-(r/2)-1/2 = 0
11/2*r-1/2 = 0 // + 1/2
11/2*r = 1/2 // : 11/2
r = 1/2/11/2
r = 1/11
r = 1/11
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