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k in (-oo:+oo)
(7*k)/8-(5*k)-(3/4) = 3/8 // - 3/8
(7*k)/8-(5*k)-(3/4)-(3/8) = 0
(7*k)/8-5*k-3/4-3/8 = 0
-33/8*k-9/8 = 0 // + 9/8
-33/8*k = 9/8 // : -33/8
k = 9/8/(-33/8)
k = -3/11
k = -3/11
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