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k in (-oo:+oo)
(4/5)*k-k-(1/4) = (1/20)*(k+1) // - (1/20)*(k+1)
(4/5)*k-((1/20)*(k+1))-k-(1/4) = 0
(-1/20)*(k+1)+(4/5)*k-k-1/4 = 0
(4*k)/5-1/20*(k+1)-k-1/4 = 0
(-1/20*4*5*(k+1))/(4*5)+(4*4*k)/(4*5)+(4*5*(-k))/(4*5)+(-1*5)/(4*5) = 0
4*4*k-1/20*4*5*(k+1)+4*5*(-k)-1*5 = 0
15*k-20*k-5-1 = 0
-5*k-5-1 = 0
-5*k-6 = 0
(-5*k-6)/(4*5) = 0
(-5*k-6)/(4*5) = 0 // * 4*5
-5*k-6 = 0
-5*k-6 = 0 // + 6
-5*k = 6 // : -5
k = 6/(-5)
k = -6/5
k = -6/5
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