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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100/x-1 = 20 // - 20
100/x-20-1 = 0
100*x^-1 = 21 // : 100
x^-1 = 21/100
-1 < 0
1/(x^1) = 21/100 // * x^1
1 = 21/100*x^1 // : 21/100
100/21 = x^1
x = 100/21
x = 100/21
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