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k in (-oo:+oo)
(2/3)*k-k+1/2 = (1/6)*k-51 // - (1/6)*k-51
(2/3)*k-k-((1/6)*k)+1/2+51 = 0
(2/3)*k-k+(-1/6)*k+1/2+51 = 0
103/2-1/2*k = 0 // - 103/2
-1/2*k = -103/2 // : -1/2
k = -103/2/(-1/2)
k = 103
k = 103
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