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