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