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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-48 = 0
-6*k-48 = 0
-6*k-48 = 0 // + 48
-6*k = 48 // : -6
k = 48/(-6)
k = -8
k = -8
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