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