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k in (-oo:+oo)
9-((3/4)*k) = 17/2 // - 17/2
9-((3/4)*k)-(17/2) = 0
(-3/4)*k-17/2+9 = 0
1/2-3/4*k = 0 // - 1/2
-3/4*k = -1/2 // : -3/4
k = -1/2/(-3/4)
k = 2/3
k = 2/3
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