Consider a perfectly competitive market with market supply of Q_S = -1.67 + .33P and market demand of Q_D = 25 - .5P.Suppose the government subsidizes this market with a subsidy of $5 per unit.What is the equilibrium quantity traded before the subsidy? Please round and write the answer and round to two decimals, for example 3.54 or 5.65.Use a minus sign to indicate if the number is negative.