The reactants are hydrochloric acid (HCl) and calcium carbonate (CaCO3), and the products are carbon dioxide (CO2), water (H2O), and calcium chloride (CaCl2). So the unbalanced equation is:
\[ \mathrm{HCl + CaCO_{3} \rightarrow CO_{2} + H_{2}O + CaCl_{2}} \]
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