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k in (-oo:+oo)
(3/5)*k-1/7 = 17/175 // - 17/175
(3/5)*k-1/7-(17/175) = 0
(3/5)*k-1/7-17/175 = 0
3/5*k-6/25 = 0 // + 6/25
3/5*k = 6/25 // : 3/5
k = 6/25/3/5
k = 2/5
k = 2/5
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