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Hey! When numbering multiple constituents, always aim for the lowest sum total. If there is equal numbering between constituents (for example 2,3 or 3,2) then apply the lowest number to the first alphabetical constituent, not including the prefixes.
The way I see it is that we should strive to have the longest carbon chain. Also you want the first number to be the lowest I think. So if you have a 2 or 4-methyl and a 2 or 4-ethyl on a pentane, you would write 2-ethyl-4methylpentane.
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