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k in (-oo:+oo)
k/4-(5/8) = k+2/12 // - k+2/12
k/4-k-(5/8)-(2/12) = 0
k/4-k-5/8-1/6 = 0
-3/4*k-19/24 = 0 // + 19/24
-3/4*k = 19/24 // : -3/4
k = 19/24/(-3/4)
k = -19/18
k = -19/18
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