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k in (-oo:+oo)
(1/4)*k-3/20 = k+3/4-3 // - k+3/4-3
(1/4)*k-k-3/20-(3/4)+3 = 0
(1/4)*k-k-3/20-3/4+3 = 0
21/10-3/4*k = 0 // - 21/10
-3/4*k = -21/10 // : -3/4
k = -21/10/(-3/4)
k = 14/5
k = 14/5
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