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k in (-oo:+oo)
7*k-(14*k)-(14/8) = 0
7*k-14*k-7/4 = 0
-7*k-7/4 = 0 // + 7/4
-7*k = 7/4 // : -7
k = 7/4/(-7)
k = -1/4
k = -1/4
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