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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-3 = 3/X-5 // - 3/X-5
1/x-(3/X)-3+5 = 0
1/x-3*X^-1-3+5 = 0
1*x^-1 = -(2-3*X^-1) // : 1
x^-1 = -(2-3*X^-1)
-1 < 0
1/(x^1) = -(2-3*X^-1) // * x^1
1 = x^1*(-(2-3*X^-1)) // : -(2-3*X^-1)
-(2-3*X^-1)^-1 = x^1
x = (2-3*X^-1)^-1
x = (2-3*X^-1)^-1
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