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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*y)/y-x-y+(5*x)/x = 0
(5*x)/x-x-y+(5*y)/y = 0
(5*y)/y-x-y+(5*x)/x = 0
10-x-y = 0 // - 10-y
-x = -(10-y) // * -1
x = 10-y
x = 10-y
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