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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 3/x-5 // - 3/x-5
y-(3/x)+5 = 0
y-3*x^-1+5 = 0
-3*x^-1 = -(y+5) // : -3
x^-1 = (y+5)/3
-1 < 0
1/(x^1) = (y+5)/3 // * x^1
1 = x^1*((y+5)/3) // : (y+5)/3
3*(y+5)^-1 = x^1
x = 3*(y+5)^-1
x = 3*(y+5)^-1
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