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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(99*x)/(x^2)-100 = 0
99*x^-1 = 100 // : 99
x^-1 = 100/99
-1 < 0
1/(x^1) = 100/99 // * x^1
1 = 100/99*x^1 // : 100/99
99/100 = x^1
x = 99/100
x = 99/100
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