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k in (-oo:+oo)
k-4 = 4*k-19 // - 4*k-19
k-(4*k)-4+19 = 0
k-4*k-4+19 = 0
15-3*k = 0 // - 15
-3*k = -15 // : -3
k = -15/(-3)
k = 5
k = 5
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