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1/x + 1/y = 5
1/x - 1/y = 11......(+)
2/x = 16 --->x = 1/8
1/x + 1/y = 5
8 + 1/y = 5
1/y = -3
y = - 1/3
(x, y) = ( 1/8 , -1/3)