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