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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 6/x-3 // - 6/x-3
y-(6/x)+3 = 0
y-6*x^-1+3 = 0
-6*x^-1 = -(y+3) // : -6
x^-1 = (y+3)/6
-1 < 0
1/(x^1) = (y+3)/6 // * x^1
1 = x^1*((y+3)/6) // : (y+3)/6
6*(y+3)^-1 = x^1
x = 6*(y+3)^-1
x = 6*(y+3)^-1
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