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x + y = 25
2x -1 = 5y
x + y = 25
2x -5y = 1 multiplicas arriba por 5
5x + 5y = 125
2x - 5y = 1 sumas columnas se cancelan las "y"
7x = 126
x = 126/7
x = 18 sustituimos en la "original" x + y = 25
18 + y = 25 entonces "y" = 7
R/Los números son 18 y 7.