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Aplicamos propiedad distributiva
12x² - 9x - 16x + 12 = 12x² - 30x - 8x + 20
12x² - 25x + 12 = 12x² - 38x + 20
12x² - 12x² - 25x + 38x = 20 - 12
13x = 8
x = 8/13
Respuesta.
x = 8/13