En resumen

X(x - 1)! = 12. 11. 10! X(x - 1)! = 12. 11! x(x - 1)! = 12. (12 - 1)! X = 12.

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X(x - 1)!

= 12.

11. 10!

X(x - 1)!

= 12.

11! x(x - 1)!

= 12.

(12 - 1)!

X = 12.