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k in (-oo:+oo)
6 = (-2/7)*k-14 // - (-2/7)*k-14
6-((-2/7)*k)+14 = 0
(2/7)*k+6+14 = 0
2/7*k+20 = 0 // - 20
2/7*k = -20 // : 2/7
k = -20/2/7
k = -70
k = -70
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