7 H2O2-I + 2 KMnVIIO4 + 3 H2SVIO4 K2SIIO2 + 2 MnIISVIO4 + 7 O20 + 10 H2O

This is an oxidation-reduction (redox) reaction:

2 MnVII + 10 e- 2 MnII (reduction)

SVI + 4 e- SII (reduction)

14 O-I - 14 e- 14 O0 (oxidation)

Change the oxidation states