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In a combustion reaction, balancing C and H should always go first. Since O2 is always by itself, it is easiest to balance this reactant last. In general, however, like what Jennah said, the element that occurs the least should be balanced first.
Personally, it seems easiest to choose the most "complex" compound from the reactants and begin balancing the corresponding elements on the product side. This way, you can get rid of the more difficult compounds at the beginning, and the rest will be easier to balance.
Honestly, when balancing equations I usually go with the first one that comes in the order of the equation and from there I balance the rest. I might need to go back and fix ones that I already balanced, but this usually works.
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