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k in (-oo:+oo)
7*k-(5*k)-(14/10) = 0
7*k-5*k-7/5 = 0
2*k-7/5 = 0 // + 7/5
2*k = 7/5 // : 2
k = 7/5/2
k = 7/10
k = 7/10
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