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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6689/x = 196/1100 // - 196/1100
6689/x-(196/1100) = 0
6689/x-49/275 = 0
6689*x^-1 = 49/275 // : 6689
x^-1 = 49/1839475
-1 < 0
1/(x^1) = 49/1839475 // * x^1
1 = 49/1839475*x^1 // : 49/1839475
1839475/49 = x^1
x = 1839475/49
x = 1839475/49
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