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k in (-oo:+oo)
7/6-((5*k)/16)-(3/4) = 3/8 // - 3/8
7/6-((5*k)/16)-(3/4)-(3/8) = 0
(-5/16)*k+7/6-3/4-3/8 = 0
1/24-5/16*k = 0 // - 1/24
-5/16*k = -1/24 // : -5/16
k = -1/24/(-5/16)
k = 2/15
k = 2/15
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