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