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k in (-oo:+oo)
1-k = 4*k-49 // - 4*k-49
1-k-(4*k)+49 = 0
1-k-4*k+49 = 0
50-5*k = 0 // - 50
-5*k = -50 // : -5
k = -50/(-5)
k = 10
k = 10
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