If one root of the equation x2 + px + 12 = 0 is 4 and the equation x2 + px + q = 0 have equal roots, then the value of q is_______.

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If one root of the equation x2 + px + 12 = 0 is 4 and the equation x2 + px + q = 0 have equal roots, then the value of q is_______.