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k in (-oo:+oo)
1-5*k = -19/6 // + -19/6
1-5*k-(-19/6) = 0
19/6-5*k+1 = 0
25/6-5*k = 0 // - 25/6
-5*k = -25/6 // : -5
k = -25/6/(-5)
k = 5/6
k = 5/6
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