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k in (-oo:+oo)
3*(5*k-1) = 177 // - 177
3*(5*k-1)-177 = 0
3*(5*k-1)-177 = 0
15*k-180 = 0
15*k-180 = 0
15*k-180 = 0 // + 180
15*k = 180 // : 15
k = 180/15
k = 12
k = 12
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