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k in (-oo:+oo)
(4/5)*k-5 = (2/5)*k-7 // - (2/5)*k-7
(4/5)*k-((2/5)*k)-5+7 = 0
(4/5)*k+(-2/5)*k-5+7 = 0
2/5*k+2 = 0 // - 2
2/5*k = -2 // : 2/5
k = -2/2/5
k = -5
k = -5
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