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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 5/100 // - 5/100
1/x-(5/100) = 0
1/x-1/20 = 0
1*x^-1 = 1/20 // : 1
x^-1 = 1/20
-1 < 0
1/(x^1) = 1/20 // * x^1
1 = 1/20*x^1 // : 1/20
20 = x^1
x = 20
x = 20
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