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k in (-oo:+oo)
k/4-k = 8 // - 8
k/4-k-8 = 0
-3/4*k-8 = 0 // + 8
-3/4*k = 8 // : -3/4
k = 8/(-3/4)
k = -32/3
k = -32/3
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