Why is the ratio of gas density equal to the ratio of molar mass at the same temperature and pressure?

According to the gas equation of ideal state, PV = NRT, where p is the pressure of ideal gas, V is the volume of ideal gas, n is the amount of gas substance in ideal gas, R is the constant of ideal gas and universal gas, t is the absolute temperature of ideal gas, because n = m / m, density = m / V, then v = m / density, when t p is the same

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