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It essentially depends on the problem. Whichever factor is held constant, you can turn the others into deltas. For example, in an isothermal, irreversible reaction, the temperature stays the same, so you can use V and P since they change.
If you change a variable on one side of the equation to a delta, so either delta P or delta T, you have to change a variable on the other side of the equation, so it would either be delta T or delta n. There cannot be a delta R as this is a constant. You can use the information given in the problem to determine which one to change to delta and which one to keep constant. Hope this helps!
When changing a variable to a delta, you must make sure to change a variable on the other side of the equation to a delta as well; these variables include P, T, or n. R can not be a delta because it is a constant.
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