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k in (-oo:+oo)
(1/2)*k-k-(1/4) = (1/8)*(k+4) // - (1/8)*(k+4)
(1/2)*k-((1/8)*(k+4))-k-(1/4) = 0
(-1/8)*(k+4)+(1/2)*k-k-1/4 = 0
k/2-1/8*(k+4)-k-1/4 = 0
(-1/8*2*4*(k+4))/(2*4)+(4*k)/(2*4)+(2*4*(-k))/(2*4)+(-1*2)/(2*4) = 0
4*k-1/8*2*4*(k+4)+2*4*(-k)-1*2 = 0
3*k-8*k-4-2 = 0
-5*k-4-2 = 0
-5*k-6 = 0
(-5*k-6)/(2*4) = 0
(-5*k-6)/(2*4) = 0 // * 2*4
-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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