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Which of the following half-equations is balanced correctly?
MnO4- + 8H+ + 5e → Mn2+ 4H2O
MnO4- + 8H+ + 8e → Mn2+ 4H2O
2MnO4- + 8H+ + 5e → 2Mn2+ 4H2O
MnO4- + 5H+ + 5e → Mn2+ 4H2O
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