83. After mixing gases A and B in the system A (g) B (g) ↔ C (g) D (g), equilibrium is established at the following concentrations: [A] \u003d 0.05 mol / l, [C] \u003d 0, 02 mol/l. The equilibrium constant is 4*10-2. Find the initial concentrations of substances A and B.

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