Breann solved the system of equations below. What mistake did she make in her work?

2x + y = 5

x - 2y = 10

y = 5 - 2x

x - 2 (5 - 2x) = 10

x - 10 + 4x = 10

5x - 10 = 10

5x = 20

x = 4

2 (4) + y = 5

y = - 3

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