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k in (-oo:+oo)
(11/2)*k-((7/40)*k)+3/20 = 0
(11/2)*k+(-7/40)*k+3/20 = 0
213/40*k+3/20 = 0 // - 3/20
213/40*k = -3/20 // : 213/40
k = -3/20/213/40
k = -2/71
k = -2/71
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