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Yes, there is no need to go higher than the least common multiple because the sole goal is to just cancel them out. Furthermore, we want to keep the reaction as a whole in its simplest form as it is a representation, so to have extra molecules in this equation will be superfluous.
You can theoretically multiply the equations by any higher multiple as long as the electrons cancel out, but it's standard convention to have the coefficients in the final equation in their lowest whole number forms.
It would make most sense the multiply by the least common multiple so you won't have to do additional simplification at the end, however theoretically you could multiply by any multiple as long as the electrons cancel out
The electrons on the left side of the equation must cancel with the electrons on the right side of the equation. It is simplest to do this using the least common multiple. However, as long as the electrons cancel, you can use a higher multiple and then simplify the equation after.
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