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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/8 = 306/x // - 306/x
3/8-(306/x) = 0
3/8-306*x^-1 = 0
-306*x^-1 = -3/8 // : -306
x^-1 = 1/816
-1 < 0
1/(x^1) = 1/816 // * x^1
1 = 1/816*x^1 // : 1/816
816 = x^1
x = 816
x = 816
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