Answer: 6CO2 + 6H2O ---> C6H12O6 +6O2
sunlight
Couldn't do subscripts on my phone, but you probably know to put the 2s like that anyway, glad to help.
Explanation: The amount of matter that you start with you end with so you will have 6 carbon dioxide molecules and 6 water molecules and end up with the same amount of matter in your products, according to the law of conservation of matter.