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b. Mn + 2O = 0
Mn -4 = 0
Mn = +4
c. Mn + 4O =0
Mn - 8 = 0
Mn = +8
d. K + Mn + 4O = 0
1 + Mn - 8 = 0
Mn = +7
e. 2Mn + 3O = 0
2Mn -6 =0
2Mn = 6
Mn = +3