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k in (-oo:+oo)
(3/5)*k+7 = 14/5 // - 14/5
(3/5)*k-(14/5)+7 = 0
(3/5)*k-14/5+7 = 0
3/5*k+21/5 = 0 // - 21/5
3/5*k = -21/5 // : 3/5
k = -21/5/3/5
k = -7
k = -7
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