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k in (-oo:+oo)
-4*k-2 = 5*k-56 // - 5*k-56
56-4*k-(5*k)-2 = 0
56-4*k-5*k-2 = 0
54-9*k = 0 // - 54
-9*k = -54 // : -9
k = -54/(-9)
k = 6
k = 6
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