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k in (-oo:+oo)
(7*k)/8-((5*k)/16)-(3/8) = 3/4 // - 3/4
(7*k)/8-((5*k)/16)-(3/8)-(3/4) = 0
(7*k)/8+(-5/16)*k-3/8-3/4 = 0
9/16*k-9/8 = 0 // + 9/8
9/16*k = 9/8 // : 9/16
k = 9/8/9/16
k = 2
k = 2
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