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k in (-oo:+oo)
3*(4*k-9) = 69 // - 69
3*(4*k-9)-69 = 0
3*(4*k-9)-69 = 0
12*k-96 = 0
12*k-96 = 0
12*k-96 = 0 // + 96
12*k = 96 // : 12
k = 96/12
k = 8
k = 8
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