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k in (-oo:+oo)
-7 = k/2-5 // - k/2-5
5-(k/2)-7 = 0
-1/2*k-2 = 0 // + 2
-1/2*k = 2 // : -1/2
k = 2/(-1/2)
k = -4
k = -4
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