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k in (-oo:+oo)
(2/7)*k-((1/14)*k) = -7 // + 7
(2/7)*k-((1/14)*k)+7 = 0
(2/7)*k+(-1/14)*k+7 = 0
3/14*k+7 = 0 // - 7
3/14*k = -7 // : 3/14
k = -7/3/14
k = -98/3
k = -98/3
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