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k in (-oo:+oo)
(k+4)/4+(k-1)/4 = k*((k+4)/4) // - k*((k+4)/4)
(k+4)/4+(k-1)/4-(k*((k+4)/4)) = 0
(k+4)/4+(k-1)/4+(-1*k*(k+4))/4 = 0
k-1*k*(k+4)+k-1+4 = 0
2*k-k^2-4*k+3 = 0
3-k^2-2*k = 0
3-k^2-2*k = 0
3-k^2-2*k = 0
DELTA = (-2)^2-(-1*3*4)
DELTA = 16
DELTA > 0
k = (16^(1/2)+2)/(-1*2) or k = (2-16^(1/2))/(-1*2)
k = -3 or k = 1
(k+3)*(k-1) = 0
((k+3)*(k-1))/4 = 0
((k+3)*(k-1))/4 = 0 // * 4
(k+3)*(k-1) = 0
( k+3 )
k+3 = 0 // - 3
k = -3
( k-1 )
k-1 = 0 // + 1
k = 1
k in { -3, 1 }
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