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Numero x
Triple del numero 3x
3x-x=30
2x=30
x=15
Comprobación
3(15)-15=30
30=30
Saludos!
El triple = 3x
Resolvemos :
3x - 18 = 30
3x = 30 + 18
3x = 48
x = 48/3
x = 16
Solución : El número es 16