Al2O3 -> Al2(SO4)3:
2Al2O3 + 3H2SO4 -> 2Al2(SO4)3 + 3H2O

Al2(SO4)3 -> X:
Al2(SO4)3 contains aluminum and sulfate ions. To convert it to X, which contains aluminum and oxygen ions, the aluminum sulfate needs to be decomposed into its constituent elements.

X -> Al2O3:
2Al + 3O2 -> 2Al2O3

Fe -> X:
Fe + 3/2O2 -> Fe2O3

X -> Fe(OH)2:
Fe2O3 + 3H2O -> 2Fe(OH)2

Fe(OH)2 -> FeSO4:
Fe(OH)2 + H2SO4 -> FeSO4 + 2H2O

Therefore, the complete transformation from Al2O3 to FeSO4 would be:
Al2O3 -> Al2(SO4)3 -> X -> Al2O3
Fe -> X -> Fe(OH)2 -> FeSO4