At a unit price of $760, the quantity demanded of a certain commodity is 80 pounds. If the unit price increases to $880, the quantity demanded decreases by 30 pounds. Find the demand equation (assuming it is linear) where p is the unit price and x is the quantity demanded for this commodity in pounds. At what price are no consumers willing to buy this commodity? According to the above model, how many pounds of this commodity would consumers take if it was free? pounds

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