2 KMnVIIO4 + 3 Na2SIVO3 + H2O 2 MnIVO2 + 3 Na2SVIO4 + 2 KOH

This is an oxidation-reduction (redox) reaction:

2 MnVII + 6 e- 2 MnIV (reduction)

3 SIV - 6 e- 3 SVI (oxidation)

Change the oxidation states