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Brackets are necessary as it helps to differentiate between the different parts of chemical formulae. For example, take ammonium hydrogen phosphate. The chemical formula is: (NH4)2HPO4.
The brackets signify that there are two NH4 atoms in the formula. If the brackets weren't there then it would be: NH42HPO3.
Now it looks like that the one nitrogen atom is bonded to 42 hydrogen atoms and one phosphate molecule.
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