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