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k in (-oo:+oo)
(1/4)*k-k-(1/2) = (1/8)*(k+1) // - (1/8)*(k+1)
(1/4)*k-((1/8)*(k+1))-k-(1/2) = 0
(-1/8)*(k+1)+(1/4)*k-k-1/2 = 0
k/4-1/8*(k+1)-k-1/2 = 0
(-1/8*2*4*(k+1))/(2*4)+(2*k)/(2*4)+(2*4*(-k))/(2*4)+(-1*4)/(2*4) = 0
2*k-1/8*2*4*(k+1)+2*4*(-k)-1*4 = 0
k-8*k-4-1 = 0
-7*k-4-1 = 0
-7*k-5 = 0
(-7*k-5)/(2*4) = 0
(-7*k-5)/(2*4) = 0 // * 2*4
-7*k-5 = 0
-7*k-5 = 0 // + 5
-7*k = 5 // : -7
k = 5/(-7)
k = -5/7
k = -5/7
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