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Ángela = x
Resolvemos :
x - 25 + x = 47
x + x - 25 = 47
2x - 25 = 47
2x = 47 + 25
2x = 72
x = 72/2
x = 36
x - 25 = 36 - 25 = 11
Solución :
Manuela tiene 11 años
Ángela tiene 36 años