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x² + 7x - 78 → Factorizas trinomio de la forma x² + bx + c
----------------- =
x² - 36 →Diferencia de cuadrados
(x + 13)(x - 6)
------------------- = Simplificas x - 6
(x + 6)(x - 6)
x + 13
---------
x + 6
Respuesta.
x + 13/(x + 6)