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