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The formal charges could be useful in determining the most favorable arrangement of atoms in a molecule, and therefore the most likely Lewis structure. The Lewis structure with formal charges closest to zero is, typically, most likely because it usually represents the lowest-energy arrangement of atoms and electrons.
Generally the most stable configuration is one where the formal charge is minimized on all the atoms involved. Usually you don't have to draw them but it can be helpful if a test question were to ask of the two lewis structures which one is favored.
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