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k in (-oo:+oo)
29/5 = (-1/5)*(-10*k-4) // - (-1/5)*(-10*k-4)
29/5-((-1/5)*(-10*k-4)) = 0
(1/5)*(-10*k-4)+29/5 = 0
1/5*(-10*k-4)+29/5 = 0
(1/5*5*(-10*k-4))/5+29/5 = 0
1/5*5*(-10*k-4)+29 = 0
25-10*k = 0
(25-10*k)/5 = 0
(25-10*k)/5 = 0 // * 5
25-10*k = 0
25-10*k = 0 // - 25
-10*k = -25 // : -10
k = -25/(-10)
k = 5/2
k = 5/2
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