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k in (-oo:+oo)
(4/5)*k+3/4 = 3/20 // - 3/20
(4/5)*k+3/4-(3/20) = 0
(4/5)*k+3/4-3/20 = 0
4/5*k+3/5 = 0 // - 3/5
4/5*k = -3/5 // : 4/5
k = -3/5/4/5
k = -3/4
k = -3/4
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