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El numero = x
El doble del numero = 2x
2x + 20 = 62
2x = 62 - 20
2x = 42
x = 42/2
x = 21
Respuesta.
El numero es el 21
El doble es = 2x
Resolvemos :
2x + 20 = 62
2x = 62 - 20
2x = 42
x = 42/2
x = 21
Respuesta : El número es = 21