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2(Fe)+3(S)+12(O)
2(Fe)+3(6)+12(-2)
2(Fe)+18-24
2Fe-6
2Fe=6
Fe=+3
O= -2
S=+6
(SO4)-2
S+4(O)= -2
S+4(-2)= -2
S+(-8)= -2
S=-2+8
S= +6