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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
21/x = 26 // - 26
21/x-26 = 0
21*x^-1 = 26 // : 21
x^-1 = 26/21
-1 < 0
1/(x^1) = 26/21 // * x^1
1 = 26/21*x^1 // : 26/21
21/26 = x^1
x = 21/26
x = 21/26
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