J.R. S. answered 04/25/19
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MnO4- + 8H+ + 5e- ===> Mn2+ + 4H2O [x2]
C2O42- ==> 2CO2 + 2e- [x5]
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2MnO4- + 16H+ + 5C2O42- ===> 2Mn2+ + 8H2O + 10CO2