Answer:
See below
Step-by-step explanation:
Coefficient on Fe₃(PO₄)₂ is incorrect => such means sum of mass reactants does not equal sum mass of products. Violates Law of Conservation of Matter in chemical reactions.
Correct balance is ...
6LiBr + Fe₃(PO₄)₂ => 2Li₃PO₄ + 3FeBr₂