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k in (-oo:+oo)
3*(5*k+5) = 135 // - 135
3*(5*k+5)-135 = 0
3*(5*k+5)-135 = 0
15*k-120 = 0
15*k-120 = 0
15*k-120 = 0 // + 120
15*k = 120 // : 15
k = 120/15
k = 8
k = 8
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