At a certain temperature, the equilibrium constant for the chemical reaction shown is 1.58×10−3. At equilibrium, the concentration of AB is 2.725 M, the concentration of BC is 2.125 M, and the concentration of AC is 0.170 M. Calculate the concentration of B at equilibrium.

AB(aq)+BC(aq)↽−−⇀AC(aq)+2B(aq)