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k in (-oo:+oo)
20 = 6*k-3*k-4 // - 6*k-3*k-4
4-(-3*k)-(6*k)+20 = 0
3*k-6*k+4+20 = 0
24-3*k = 0 // - 24
-3*k = -24 // : -3
k = -24/(-3)
k = 8
k = 8
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