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k in (-oo:+oo)
(3/4)*k-k-(1/4) = (1/16)*(k+4) // - (1/16)*(k+4)
(3/4)*k-((1/16)*(k+4))-k-(1/4) = 0
(-1/16)*(k+4)+(3/4)*k-k-1/4 = 0
(3*k)/4-1/16*(k+4)-k-1/4 = 0
(-1/16*4*(k+4))/4+(3*k)/4+(4*(-k))/4-1/4 = 0
3*k-1/16*4*(k+4)+4*(-k)-1 = 0
11/4*k-4*k-1-1 = 0
-5/4*k-1-1 = 0
-5/4*k-2 = 0
(-5/4*k-2)/4 = 0
(-5/4*k-2)/4 = 0 // * 4
-5/4*k-2 = 0
-5/4*k-2 = 0 // + 2
-5/4*k = 2 // : -5/4
k = 2/(-5/4)
k = -8/5
k = -8/5
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