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k in (-oo:+oo)
3*k-9 = k/4 // - k/4
3*k-(k/4)-9 = 0
11/4*k-9 = 0 // + 9
11/4*k = 9 // : 11/4
k = 9/11/4
k = 36/11
k = 36/11
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