The discussion centers on the mass balance equations for the production of styrene from ethylbenzene. The user is seeking assistance with a specific problem related to mole proportions of various species involved in the reaction. The key components include ethylbenzene (EB), styrene, hydrogen (H2), benzene (Bz), ethylene, toluene, and methane, with their respective mole proportions expressed in terms of variables x, y, and z. The user is instructed to specify values for x (0.3, 0.4, 0.5, 0.6) and derive formulas for y and z as functions of x. The final step involves prorating the calculated moles to determine the correct amount of product and conducting an economic analysis on the products and fuel requirements to evaluate overall feasibility.