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k in (-oo:+oo)
(7/2)*k-((1/14)*k) = -3 // + 3
(7/2)*k-((1/14)*k)+3 = 0
(7/2)*k+(-1/14)*k+3 = 0
24/7*k+3 = 0 // - 3
24/7*k = -3 // : 24/7
k = -3/24/7
k = -7/8
k = -7/8
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