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k in (-oo:+oo)
(3/5)*k-k-(1/4) = (1/20)*(k+4) // - (1/20)*(k+4)
(3/5)*k-((1/20)*(k+4))-k-(1/4) = 0
(-1/20)*(k+4)+(3/5)*k-k-1/4 = 0
(3*k)/5-1/20*(k+4)-k-1/4 = 0
(-1/20*4*5*(k+4))/(4*5)+(3*4*k)/(4*5)+(4*5*(-k))/(4*5)+(-1*5)/(4*5) = 0
3*4*k-1/20*4*5*(k+4)+4*5*(-k)-1*5 = 0
11*k-20*k-5-4 = 0
-9*k-5-4 = 0
-9*k-9 = 0
(-9*k-9)/(4*5) = 0
(-9*k-9)/(4*5) = 0 // * 4*5
-9*k-9 = 0
-9*k-9 = 0 // + 9
-9*k = 9 // : -9
k = 9/(-9)
k = -1
k = -1
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