In the cellen there is glucose that is fermented. You should follow the reaction paths the glucose molecules can take, through glycolysis and "Mixed acid fermentation" to the end products you see in the reaction overview. From one glucose are formed 2 phosphoenolpyruvate. Then there are several possible paths. In the case of phosphoenolpyruvate, pyruvate and acetylCoA, the pathways divide and one molecule can go one way while the other goes another way. In the task, acetate is a given end product, but which is the other for the summation reaction to be both stoichiometric and redox balanced?

glucose glycolysis PA CO acetoin phosphoenolpyruvate oxaloacetate H' + ADP PPC CO2 NADH-H C-ALD PYK MDH CO2 H ATP H NAD NADH+H NAD a-acetolactate - pyruvate u lactate ' malate C-ALS LDH COA CO2 H FUM HO H2 FHL PFL formate acetyl-CoA NADH+H P. fumarate NADH+H FRD NAD 7 K COA+NAD ADH PTA CoA acetaldehyde acetyl-phosphate succinate NADH+H ADP ADH ACK het NAD ATP ethanol acetate