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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.5/x = 11/28 // - 11/28
3.5/x-(11/28) = 0
3.5/x-11/28 = 0
3.5*x^-1 = 11/28 // : 3.5
x^-1 = 0.1122449
-1 < 0
1/(x^1) = 0.1122449 // * x^1
1 = 0.1122449*x^1 // : 0.1122449
8.90909075 = x^1
x = 8.90909075
x = 8.90909075
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