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x+14=3x
x-3x=-14
-2x=-14
x=7
comprovacion
7+14=21
3 veces 7
7+7+7=21
El numero = x
3 veces el numero = 3x
x + 14 = 3x
14 = 3x - x
14 = 2x
14/2 = x
7 = x
Respuesta.
El numero es el 7