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k in (-oo:+oo)
(3/4)*k+5/8 = 19/16 // - 19/16
(3/4)*k+5/8-(19/16) = 0
(3/4)*k+5/8-19/16 = 0
3/4*k-9/16 = 0 // + 9/16
3/4*k = 9/16 // : 3/4
k = 9/16/3/4
k = 3/4
k = 3/4
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