Changing air composition on another planet

Hypothetically speaking, if we would find another planet, the size of Earth, with atmosphere as dense as Earth's atmosphere is, and we would insert (in some hypothetical way) nitrogen, oxygen and CO2 in the quantity they are found on Earth, and (again in a hypothetical way) we would "get out" whatever gases are in that planet's atmosphere, would it be possible to create an environment in which we could breathe?

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Changing air composition on another planet

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