Word Count : 271

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Under perfect competition, the equilibrium occurs where quantity demanded equals quantity supplied: [ P_D = P_S ] [ 27 - Q^2 = 4Q + 6 ] Bring all terms to one side: [ Q^2 + 4Q + 6 - 27 = 0 ] [ Q^2 + 4Q - 21 = 0 ] Solve the _________ _________ _________ ___ ____ __________ ____ ___.
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