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x*3x = (4x+8)*(x-2)
3x^2 = 4x^2 - 8x + 8x -16
3x^2 = 4x^2 - 16
3x^2 - 4x^2 = -16
-x^2 = -16
x^2 = 16
x = + o - raiz cuadrada de 16
x = + o - 4
la respuesta es x = a mas(+) o menos(-) 4