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María = x
Juan = x - 8
María = x + 4
3 (x - 8) = x + 4
3x - 24 = x + 4
3x - x = 4 + 24
2x = 28
x = 28/2
x = 14
x - 12 = 14 - 12 = 2
Solución :
Juan tiene 2 años
María tiene 14 años