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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4206/x = 168/1100 // - 168/1100
4206/x-(168/1100) = 0
4206/x-42/275 = 0
4206*x^-1 = 42/275 // : 4206
x^-1 = 7/192775
-1 < 0
1/(x^1) = 7/192775 // * x^1
1 = 7/192775*x^1 // : 7/192775
192775/7 = x^1
x = 192775/7
x = 192775/7
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