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k in (-oo:+oo)
5*(6*k-1) = 235 // - 235
5*(6*k-1)-235 = 0
5*(6*k-1)-235 = 0
30*k-240 = 0
30*k-240 = 0
30*k-240 = 0 // + 240
30*k = 240 // : 30
k = 240/30
k = 8
k = 8
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