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k in (-oo:+oo)
(3/4)*k-k-(1/5) = (1/20)*(k+1) // - (1/20)*(k+1)
(3/4)*k-((1/20)*(k+1))-k-(1/5) = 0
(-1/20)*(k+1)+(3/4)*k-k-1/5 = 0
(3*k)/4-1/20*(k+1)-k-1/5 = 0
(-1/20*4*5*(k+1))/(4*5)+(3*5*k)/(4*5)+(4*5*(-k))/(4*5)+(-1*4)/(4*5) = 0
3*5*k-1/20*4*5*(k+1)+4*5*(-k)-1*4 = 0
14*k-20*k-4-1 = 0
-6*k-4-1 = 0
-6*k-5 = 0
(-6*k-5)/(4*5) = 0
(-6*k-5)/(4*5) = 0 // * 4*5
-6*k-5 = 0
-6*k-5 = 0 // + 5
-6*k = 5 // : -6
k = 5/(-6)
k = -5/6
k = -5/6
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