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k in (-oo:+oo)
-26 = 5*k-k+2 // - 5*k-k+2
k-(5*k)-26-2 = 0
k-5*k-26-2 = 0
-4*k-28 = 0 // + 28
-4*k = 28 // : -4
k = 28/(-4)
k = -7
k = -7
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