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k in (-oo:+oo)
-2 = (7*k)/(-4) // - (7*k)/(-4)
-((7*k)/(-4))-2 = 0
(7/4)*k-2 = 0
7/4*k-2 = 0 // + 2
7/4*k = 2 // : 7/4
k = 2/7/4
k = 8/7
k = 8/7
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