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k in (-oo:+oo)
(1/5)*k-k-(1/5) = (1/25)*(k+5) // - (1/25)*(k+5)
(1/5)*k-((1/25)*(k+5))-k-(1/5) = 0
(-1/25)*(k+5)+(1/5)*k-k-1/5 = 0
k/5-1/25*(k+5)-k-1/5 = 0
(-1/25*5*(k+5))/5+k/5+(5*(-k))/5-1/5 = 0
k-1/25*5*(k+5)+5*(-k)-1 = 0
4/5*k-5*k-1-1 = 0
-21/5*k-1-1 = 0
-21/5*k-2 = 0
(-21/5*k-2)/5 = 0
(-21/5*k-2)/5 = 0 // * 5
-21/5*k-2 = 0
-21/5*k-2 = 0 // + 2
-21/5*k = 2 // : -21/5
k = 2/(-21/5)
k = -10/21
k = -10/21
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