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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
100 = 2.8/x // - 2.8/x
100-(2.8/x) = 0
100-2.8*x^-1 = 0
-2.8*x^-1 = -100 // : -2.8
x^-1 = 35.71428571
-1 < 0
1/(x^1) = 35.71428571 // * x^1
1 = 35.71428571*x^1 // : 35.71428571
0.028 = x^1
x = 0.028
x = 0.028
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