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