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k in (-oo:+oo)
(5/7)*k-((3/5)*k)+2 = 498/245 // - 498/245
(5/7)*k-((3/5)*k)-(498/245)+2 = 0
(-3/5)*k+(5/7)*k-498/245+2 = 0
4/35*k-8/245 = 0 // + 8/245
4/35*k = 8/245 // : 4/35
k = 8/245/4/35
k = 2/7
k = 2/7
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