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