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k in (-oo:+oo)
7 = (-2/7)*k-7 // - (-2/7)*k-7
7-((-2/7)*k)+7 = 0
(2/7)*k+7+7 = 0
2/7*k+14 = 0 // - 14
2/7*k = -14 // : 2/7
k = -14/2/7
k = -49
k = -49
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