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k in (-oo:+oo)
(4/5)*k-7 = (2/5)*k+5 // - (2/5)*k+5
(4/5)*k-((2/5)*k)-7-5 = 0
(4/5)*k+(-2/5)*k-7-5 = 0
2/5*k-12 = 0 // + 12
2/5*k = 12 // : 2/5
k = 12/2/5
k = 30
k = 30
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