Answer:
4Al2O3 + 9Fe --> 3Fe3O4 + 8Al
Explanation:
Al:8 Al:8
O:12 O:12
Fe:9 Fe:9
just make sure that both sides have the same ammount. I started with Iron, balenced it to 3, then made sure i had 12 oxygen on both sides, being that i had 3 iron on the left and 9 on the right so i went back and fixed that. I then saw that i had 8 Al on the left and 1 on the right so i balenced that
