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Numero A → x
Entonces ," El doble de un numero - 5 igual a 7... " :
2x - 5 = 7
2x = 7 + 5
2x = 12
x = 12/2
x = 6
Verificacion :
2 . 6 - 5 = 7
12 - 5 = 7
7 = 7
El numero es correcto
Solución : Es el numero " 6 "