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