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k in (-oo:+oo)
4*k-3 = 6*k-13 // - 6*k-13
4*k-(6*k)-3+13 = 0
4*k-6*k-3+13 = 0
10-2*k = 0 // - 10
-2*k = -10 // : -2
k = -10/(-2)
k = 5
k = 5
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