The chemical formulas for magnetite, carbon, iron, and carbon dioxide are $\mathrm{Fe}_{3} \mathrm{O}_{4}$, C, Fe, and $\mathrm{CO}_{2}$, respectively. So, the unbalanced chemical equation is:
\[\mathrm{Fe}_{3} \mathrm{O}_{4} + \mathrm{C} \rightarrow \mathrm{Fe} +
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