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2 C8H18 + 25 O2 = 16 CO2 + 18 H20

Do it by saying C8H18 + a O2 = m CO2 + n H2O. Then match up all the atoms so you get for carbon 8=m, hydrogen 18 = 2n, oxygen 2a = 2m+n. This gives you m=8, n=9 and a=25/2. Since we don't like fractions in these equations we can sort that out by just doubling the whole way through to get the quoted result given at the beginning.

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