For the exothermic reaction 2A(aq) + B(aq) -> 2C(aq) + D(aq), the concentration-based equilibrium constant KC is 2.0 x 10-3 at 298K. If in a certain experiment equilibrium is established at 298K when the concentration [A] = 0.300M, [B] = 0.300M, and [C] = 0.300M, what must be the equilibrium concentration of D? Provide the numerical answer to the correct significant figures.

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