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k in (-oo:+oo)
(k+4)/4+(k-10)/4 = k*((k+4)/4) // - k*((k+4)/4)
(k+4)/4+(k-10)/4-(k*((k+4)/4)) = 0
(k+4)/4+(k-10)/4+(-1*k*(k+4))/4 = 0
k-1*k*(k+4)+k-10+4 = 0
2*k-k^2-4*k-6 = 0
-k^2-2*k-6 = 0
-k^2-2*k-6 = 0
-1*(k^2+2*k+6) = 0
k^2+2*k+6 = 0
DELTA = 2^2-(1*4*6)
DELTA = -20
DELTA < 0
-1 = 0
-1/4 = 0
-1/4 = 0 // * 4
-1 = 0
k belongs to the empty set
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