​D(x) is the​ price, in dollars per​ unit, that consumers are willing to pay for x units of an​ item, and​ S(x) is the​ price, in dollars per​ unit, that producers are willing to accept for x units. Find ​(a) the equilibrium​ point, ​(b) the consumer surplus at the equilibrium​ point, and ​(c) the producer surplus at the equilibrium point. D(x)=5/6x+10, S(x)=1/3x+3