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