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El doble = 2m
Resolvemos..
2m - 21 = 63
2m = 63 + 21
2m = 84
m = 84/2
m = 42
Solcuión. El número es 42
El numero = x
El doble del numero = 2x
2x - 21 = 63
2x = 63 + 21
2x = 84
x = 84/2
x = 42
Respuesta.
El numero es el 42