?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)=(x-7)^2 s(x)=x^2+4x+31