physics thermodynamics

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A gas expands from a volume of 2.00m^3 to 6.00m^3 and does 6912 joules of work against a constant outside pressure. Calculate this outside pressure in Pa.

The answer is 1730 Pa, but I don't know how to get that.

I honestly have no idea where to start or what formulas to use. Please help me.

Work= P*change in volume.

Solve for pressure.

thank you very much

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