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k in (-oo:+oo)
-2 = (15/2)*k-((1/4)*(10*k-4)) // - (15/2)*k-((1/4)*(10*k-4))
(1/4)*(10*k-4)-((15/2)*k)-2 = 0
(1/4)*(10*k-4)+(-15/2)*k-2 = 0
1/4*(10*k-4)+(-15*k)/2-2 = 0
(1/4*2*(10*k-4))/2+(-15*k)/2+(-2*2)/2 = 0
1/4*2*(10*k-4)-15*k-2*2 = 0
-10*k-4-2 = 0
-10*k-6 = 0
(-10*k-6)/2 = 0
(-10*k-6)/2 = 0 // * 2
-10*k-6 = 0
-10*k-6 = 0 // + 6
-10*k = 6 // : -10
k = 6/(-10)
k = -3/5
k = -3/5
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