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k in (-oo:+oo)
(2/5)*k-(1/4) = k // - k
(2/5)*k-k-(1/4) = 0
(2/5)*k-k-1/4 = 0
-3/5*k-1/4 = 0 // + 1/4
-3/5*k = 1/4 // : -3/5
k = 1/4/(-3/5)
k = -5/12
k = -5/12
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