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