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k in (-oo:+oo)
4*(6*k+1) = 220 // - 220
4*(6*k+1)-220 = 0
4*(6*k+1)-220 = 0
24*k-216 = 0
24*k-216 = 0
24*k-216 = 0 // + 216
24*k = 216 // : 24
k = 216/24
k = 9
k = 9
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