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k in (-oo:+oo)
9/4 = 6-5*k-(4*k) // - 6-5*k-(4*k)
4*k-(-5*k)+9/4-6 = 0
5*k+4*k+9/4-6 = 0
9*k-15/4 = 0 // + 15/4
9*k = 15/4 // : 9
k = 15/4/9
k = 5/12
k = 5/12
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