3 Cu2IS-II + 6 FeIIS2-I + 40 HNVO3 6 CuIISVIO4 + 40 NIIO + 3 Fe2III(SVIO4)3 + 20 H2O

This is an oxidation-reduction (redox) reaction:

6 CuI - 6 e- 6 CuII (oxidation)

12 S-I - 84 e- 12 SVI (oxidation)

3 S-II - 24 e- 3 SVI (oxidation)

40 NV + 120 e- 40 NII (reduction)

6 FeII - 6 e- 6 FeIII (oxidation)

Change the oxidation states