A 131 L mixing tank initially contains 58 L of brine solution with 310 g of dissolved salt. Brine solution with a concentration of 8 g/L flows into the tank at a rate of 7 L/min. The solution inside the tank is kept well-stirred and is discharged at the rate of 4 L/min. Determine the concentration of the solution, in grams/liter, inside the tank at the moment before it overflows.

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