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(x + 11) (x - 5) = x² - 1
x² - 5x + 11x - 55 = x² -1
x² + 6x - 55 + 1 = x²
x² + 6x - 54 = x²
x² + 6x - x² = 54
6x = 54
x = 54 ÷ 6
x = 9 ==> Respuesta
Entonces el numero es 9.
Espero que te ayude.
Saludos!!!