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Segundo número = y
Entonces :
2 (x + y)/3 = 74
(2x + 2y)/3 = 74
2x + 2y = 74 * 3
2x + 2y = 222
3 (x - y)/5 = 9
(3x - 3y)/5 = 9
3x - 3y = 9 * 5
3x - 3y = 45
1) 2x + 2y = 222 (3)
2) 3x - 3y = 45 (2)
6x + 6y = 666
6x - 6y = 90
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12x + 0y =756
12x = 756
x = 756/12
x = 63
Reemplazo en 1
2x + 2y = 222
2 (63) + 2y = 222
126 + 2y = 222
2y = 222 - 126
2y = 96
y = 96/2
y = 48
Solución : Los números son : 48 y 63