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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100/x-268 = 0
100*x^-1 = 268 // : 100
x^-1 = 67/25
-1 < 0
1/(x^1) = 67/25 // * x^1
1 = 67/25*x^1 // : 67/25
25/67 = x^1
x = 25/67
x = 25/67
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