When We Can Get The Equilibrium Of Supply And Demand?

Up to this point we have been considering demand and supply in isolation. We know the amounts that are willingly bought and sold at each price. We have seen that consumers demand different amounts of cars and computers as a function of these goods prices. Similarly, producers willingly supply different amounts of these and other goods depending on their prices. But how can we put both sides of the market together.
The answer is that supply and demand interacts to produce an equilibrium price and quantity, or market equilibrium. The market equilibrium comes at that price and quantity where the forces of supply and demand are in balance. At the equilibrium price, the amount that buyers want to buy is just equal to the amount that sellers want to sell. The reason we call this equilibrium is that, when the forces of supply and demand are in balance, there is no reason for price to rise or fall, as long as other things remain unchanged.    
Market equilibrium comes at the price at which quantity demanded equals quantity supplied. At that equilibrium, there is no tendency for the price to raise or fall. This denotes all supply and demand orders are filled.