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k in (-oo:+oo)
7-7*k = 19-4*k // - 19-4*k
7-7*k-(-4*k)-19 = 0
4*k-7*k-19+7 = 0
-3*k-12 = 0 // + 12
-3*k = 12 // : -3
k = 12/(-3)
k = -4
k = -4
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