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X - Y = 6 (2)
X = 12 - Y; Reemplazo en (2)
12 - Y - Y = 6
12 - 2Y = 6
-2Y = 6 -12
-2Y = - 6
Y = -6/-2 = 3
Y = 3;
X = 12 - 3 = 9
X = 9