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k in (-oo:+oo)
11/4 = k/4 // - k/4
11/4-(k/4) = 0
11/4-1/4*k = 0 // - 11/4
-1/4*k = -11/4 // : -1/4
k = -11/4/(-1/4)
k = 11
k = 11
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