Расставить коэффициенты:
а) _FeO + _O₂ -> _Fe₂O₃
б) _FeS + _O₂ -> _Fe₂O₃ + _SO₂
в) _FeO + _CO -> _Fe + _CO₂
г) _Fe₃O₄ + _C -> _Fe + _CO₂
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