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k in (-oo:+oo)
6*(4*k+5) = 126 // - 126
6*(4*k+5)-126 = 0
6*(4*k+5)-126 = 0
24*k-96 = 0
24*k-96 = 0
24*k-96 = 0 // + 96
24*k = 96 // : 24
k = 96/24
k = 4
k = 4
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