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I believe that when you are balancing a combustion equation you usually want to have a 1 for the coefficient of the hydrocarbon, or the thing you're burning, even if it means that the O2 has a coefficient that's not a whole number, such as 1/2.
A combustion reaction involves a hydrocarbon (compounds that contains only carbon and hydrogen) burning in (reacting with) diatomic oxygen to produce carbon dioxide and water. You would balance the O2 last, and you might need to use a fractional coefficient before multiplying all the coefficients by two.
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