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k in (-oo:+oo)
5-(7*k) = 3-4*k // - 3-4*k
5-(7*k)-(-4*k)-3 = 0
4*k-7*k-3+5 = 0
2-3*k = 0 // - 2
-3*k = -2 // : -3
k = -2/(-3)
k = 2/3
k = 2/3
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