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