Write a formulae equation to represent the combustion of carbon to form carbon dioxide and the thermal decomposition of magnesium carbonate

Balanced equation to represent the combustion of carbon to form carbon dioxide;

C (s) + O₂ (g) → CO₂ (g)

Balanced equation to represent the thermal decomposition of magnesium carbonate

MgCO₃ (s) → MgO (s) + CO₂ (g)