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k in (-oo:+oo)
3*(5*k+8) = 54 // - 54
3*(5*k+8)-54 = 0
3*(5*k+8)-54 = 0
15*k-30 = 0
15*k-30 = 0
15*k-30 = 0 // + 30
15*k = 30 // : 15
k = 30/15
k = 2
k = 2
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