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k in (-oo:+oo)
3*(2*k+3) = 39 // - 39
3*(2*k+3)-39 = 0
3*(2*k+3)-39 = 0
6*k-30 = 0
6*k-30 = 0
6*k-30 = 0 // + 30
6*k = 30 // : 6
k = 30/6
k = 5
k = 5
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