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k in (-oo:+oo)
12/11 = k/11 // - k/11
12/11-(k/11) = 0
12/11-1/11*k = 0 // - 12/11
-1/11*k = -12/11 // : -1/11
k = -12/11/(-1/11)
k = 12
k = 12
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