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k in (-oo:+oo)
4*k+7 = 6*k-9 // - 6*k-9
4*k-(6*k)+7+9 = 0
4*k-6*k+7+9 = 0
16-2*k = 0 // - 16
-2*k = -16 // : -2
k = -16/(-2)
k = 8
k = 8
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