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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
455/x = 20/100 // - 20/100
455/x-(20/100) = 0
455/x-1/5 = 0
455*x^-1 = 1/5 // : 455
x^-1 = 1/2275
-1 < 0
1/(x^1) = 1/2275 // * x^1
1 = 1/2275*x^1 // : 1/2275
2275 = x^1
x = 2275
x = 2275
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