Find all solutions of the given equation in the interval 
. 
Definitions:
Equilibrium Price
The market price at which the quantity of goods supplied is equal to the quantity of goods demanded.
Reaction Curve
A graph that shows how one player's optimal strategy choice depends on the strategy choice of another player.
Bertrand Model
An economic model of competition among firms in which they simultaneously choose prices rather than quantities, with the assumption that consumers choose the firm with the lowest price.
Collusion
An agreement among firms to limit competition, set prices, or control production in order to increase profits.
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