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A = (2x - 6)(x - 3)/2
A= 2x² - 6x - 6x + 18/2
A = 2x² - 12x + 18/2
A = x² - 6x + 9
Asi te queda representado:
A = x² - 6x + 9
Y desarrollando.....
(x - 3)(x -3) = 0
x1 = 3
x2 = 3