If \( x + y = -10 \), then \( x = 2 \), \( y = -8 \), check \( x - y = 2 - (-8) = 10

If \( x + y = -10 \), then \( x = 2 \), \( y = -8 \), check \( x - y = 2 - (-8) = 10

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