FeO = Iron(II) oxide
FeSO4 = Iron(II) sulfate
Fe(OH)3 = Iron(III) hydroxide
FeO = Iron(II) oxide
Fe = Iron
FeCl = Iron(III) chloride
H2O = Water
O3 = Ozone
CO3 = Carbonate
CuCO3 = Copper(II) carbonate
Ca(NO3)2 = Calcium nitrate

Therefore, the complete equation is:
Iron(II) oxide = Iron(II) sulfate = Iron(III) hydroxide = Iron(II) oxide = Iron = Iron(III) chloride = Water = Ozone = Carbonate = Copper(II) carbonate = Calcium nitrate