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k in (-oo:+oo)
(7*k)/8-((5*k)/16)-(3/4) = 8/8 // - 8/8
(7*k)/8-((5*k)/16)-(3/4)-(8/8) = 0
(7*k)/8+(-5/16)*k-3/4-1 = 0
9/16*k-7/4 = 0 // + 7/4
9/16*k = 7/4 // : 9/16
k = 7/4/9/16
k = 28/9
k = 28/9
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