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You cannot change a subscripts as that would change the molecule. You may be referring to a coefficient. If so, not having the coefficient as a fraction makes solving for the rest of the problem easier if we leave/make the coefficient whole numbers. If you ever have a fraction, most likely all you have to do is multiply the other compounds coefficients by 2, such as with your problem 33/2.
Because you can not have half of an atom, you have to make them whole numbers. Also, you have to make sure that you only change the coefficient only because changing subscripts would change the composition of the molecule.
Subscripts must never be changed because that would change the entire formula. If you have a fraction like 33/2 for one coefficient, you can just multiply the whole equation by 2 in this case to get whole numbers (which is preferable).
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