2x mas 3 = 45
2x = 45 - 3
2x = 42
x = 42 : 2
x = 21
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Edad de Pedro = x
Edad de Juan = 2x + 3
x + 2x + 3 = 45
3x + 3 = 45
3x = 45 - 3
3x = 42
x = 42/3
x = 14
Edad de Juan = 2x + 3 = 2 * 14 + 3 = 28 + 3 = 31 años
Respuesta.
Juan tiene 31 años
2x mas 3 = 45
2x = 45 - 3
2x = 42
x = 42 : 2
x = 21