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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/a-(1/x) = 1/x-(1/b) // - 1/x-(1/b)
1/a+1/b-(1/x)-(1/x) = 0
1/a+1/b-x^-1-x^-1 = 0
-2*x^-1 = -(a^-1+b^-1) // : -2
x^-1 = (a^-1+b^-1)/2
-1 < 0
1/(x^1) = (a^-1+b^-1)/2 // * x^1
1 = x^1*((a^-1+b^-1)/2) // : (a^-1+b^-1)/2
2*(a^-1+b^-1)^-1 = x^1
x = 2*(a^-1+b^-1)^-1
x = 2*(a^-1+b^-1)^-1
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