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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y/y-x-y+x/x = 0
x/x-x-y+y/y = 0
y/y-x-y+x/x = 0
2-x-y = 0 // - 2-y
-x = -(2-y) // * -1
x = 2-y
x = 2-y
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