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1. Pick the most complicated-looking formula (C_5H_12) and balance its atoms (C and H).
This gives
1C_5H_12 + ___O_2 → 5CO_2 + 6H_2O
2. Balance the remaining atoms (O).
1C_5H_12 + 8O_2 → 5CO_2 + 6H_2O
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