Why is the rate of a reaction zero at equilibrium?

Update:

I saw many answers saying that it is not zero, but both rates are equal, but I saw a textbook in which it says that the kinetic law for reaction A+B to give B+D is r=k(CA CB - CC CD/Ke), where CA,CB,CC,CD are the concentratiobs of A,B,C,D, and Ke is the equilibrium constant. They say that in equilibrium r=0. Why is that?

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