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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
247/26 = 209/x // - 209/x
247/26-(209/x) = 0
247/26-209*x^-1 = 0
-209*x^-1 = -19/2 // : -209
x^-1 = 1/22
-1 < 0
1/(x^1) = 1/22 // * x^1
1 = 1/22*x^1 // : 1/22
22 = x^1
x = 22
x = 22
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