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k in (-oo:+oo)
1/14 = -k/4 // + -k/4
1/14-(-k/4) = 0
(1/4)*k+1/14 = 0
1/4*k+1/14 = 0 // - 1/14
1/4*k = -1/14 // : 1/4
k = -1/14/1/4
k = -2/7
k = -2/7
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