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x = 2 + y
0,2x + 0,5y = 0,1 ; multiplicamos x10 a todos
2x + 5y = 1
Reemplazamos x en la 2da ecuacion
2x + 5y = 1
2(2 + y) + 5y = 1
4 + 2y + 5y = 1
7y = 1 - 4
y = -3/7
Luego
x = 2 + y
x = 2 - 3/7
x = (14 - 3)/7
x = 11/7