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k in (-oo:+oo)
-7/25 = (-5/7)*k-((2/5)*k)+1/2 // - (-5/7)*k-((2/5)*k)+1/2
(2/5)*k-((-5/7)*k)-7/25-(1/2) = 0
(5/7)*k+(2/5)*k-7/25-1/2 = 0
39/35*k-39/50 = 0 // + 39/50
39/35*k = 39/50 // : 39/35
k = 39/50/39/35
k = 7/10
k = 7/10
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