hii pls help me to balance the equation thanksss

Answer:
3Fe(s)+2O2(g)---->Fe3O4
this way you will have 3irons on both sides and 4 oxygens.
I hope this helps
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[tex]\boxed{\pmb{\red{\sf{3Fe(s) + 2O_{2}(g)\dashrightarrow Fe_{3}O_{4}(s)}}}}[/tex]
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