Respuesta: X= 4
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Respuesta: X= 4
Explicación: (x+6)! × (x+8)!
(x+6)! × (x+7)! = 12
(x+6)! × (x+8) × (x+7)!
(x+6)! × (x+7)! =12
(x+8) × (x+7)!
(x+7)! =12
x+8=12
X=12 ₋ 8
X=4