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k in (-oo:+oo)
3-k-(5*k) = -9 // + 9
3-k-(5*k)+9 = 0
3-k-5*k+9 = 0
12-6*k = 0 // - 12
-6*k = -12 // : -6
k = -12/(-6)
k = 2
k = 2
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