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k in (-oo:+oo)
14 = (-7*k)/5 // - (-7*k)/5
14-((-7*k)/5) = 0
(7/5)*k+14 = 0
7/5*k+14 = 0 // - 14
7/5*k = -14 // : 7/5
k = -14/7/5
k = -10
k = -10
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