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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y-(3/x) = 0
y-3*x^-1 = 0
-3*x^-1 = -y // : -3
x^-1 = y/3
-1 < 0
1/(x^1) = y/3 // * x^1
1 = x^1*(y/3) // : y/3
3*y^-1 = x^1
x = 3*y^-1
x = 3*y^-1
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