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k in (-oo:+oo)
3-6*k = -4*k-13 // + -4*k-13
3-6*k-(-4*k)+13 = 0
4*k-6*k+3+13 = 0
16-2*k = 0 // - 16
-2*k = -16 // : -2
k = -16/(-2)
k = 8
k = 8
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