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Despejando X - Y = 26 .... X = 26 + Y.
Reemplazando en X.Y = 1680.
(26+Y).(Y) = 1680
26Y + Y² = 1680
Y(Y+26) = 1680
Y(Y+26) = 30(30+26)
Y = 30.
Entonces:
X -Y = 26
X - 30 = 26
X = 26 + 30
X = 56.
X = 56 y Y=30.