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Sean los dos números "x" y "y" entonces
3x + y = 820
2x - y = 340 Si sumas columnas
5x = 1160
x = 1160/5
x = 232
3 * 232 + y = 820
696 + y = 820
y = 820 - 696
y = 124
R/ Los números son 232 y 124