What is the balanced equation for copper carbonate + citric acid?

A plausible balanced reaction is:

CuCO3(s)+2 H₃C₆H₅O₇(aq)→Cu(C₆H₅O₇)₂(aq)+CO₂(g)+2 H₂O(l)

Here: 1 Cu, 1 CO₃²⁻ gives CO₂ + H₂O; 2 citric acids supply the citrate ligands to form Cu(C₆H₅O₇)₂ complex. This matches patent description of copper carbonate reacting with citric acid to yield copper citrate.

If the carbonate is a basic copper carbonate (Cu₂(OH)₂CO₃) the stoichiometry would differ (two Cu etc). But the simplified form above is sufficient for board-exam style.