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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-3 = 20 // - 20
1/x-20-3 = 0
1*x^-1 = 23 // : 1
x^-1 = 23
-1 < 0
1/(x^1) = 23 // * x^1
1 = 23*x^1 // : 23
1/23 = x^1
x = 1/23
x = 1/23
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