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k in (-oo:+oo)
k-(4*k)-3 = -9 // + 9
k-(4*k)-3+9 = 0
k-4*k-3+9 = 0
6-3*k = 0 // - 6
-3*k = -6 // : -3
k = -6/(-3)
k = 2
k = 2
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