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k in (-oo:+oo)
(3/5)*k-(1/2)-(1/7) = 0
(3/5)*k-1/2-1/7 = 0
3/5*k-9/14 = 0 // + 9/14
3/5*k = 9/14 // : 3/5
k = 9/14/3/5
k = 15/14
k = 15/14
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