answer : 6CO2 + 6H2O → C6H12O8 + 5O2
Step-by-step explanation:
Label Each Compound With a Variable
 aCO2 + bH2O = cC6H12O8 + dO2
2. Create a System of Equations, One Per Element
 C: 1a + 0b = 6c + 0d
 O: 2a + 1b = 8c + 2d
 H: 0a + 2b = 12c + 0d
3. Solve For All Variables
 a = 6
 b = 6
 c = 1
 d = 5
4. Substitute and Verify Result
 6CO2 + 6H2O = C6H12O8 + 5O2