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La edad a encontrar = x
El triple de la edad = 3x
x - 12 = 3x - 48
- 12 + 48 = 3x - x
36 = 2x
36/2 = x
18= x
Respuesta.
La edad es 18 años
El triple = 3x
Restamos = - 12
Disminuida es = - 48
Resolvemos :
x - 12 = 3x - 48
x - 3x = - 48 + 12
- 2x = - 36
x = -36/-2
x = 18
Solución : La edad es = 18 años