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Adriana = x
Resolvemos :
x - 20 + x = 86
x + x - 20 = 86
2x - 20 = 86
2x = 86 + 20
2x = 106
x = 106/2
x = 53
x = 53----------53 - 20 = 33
Solución :
Lucía tiene 33 años
Adriana tiene 53 años