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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/8 = 38/x // - 38/x
1/8-(38/x) = 0
1/8-38*x^-1 = 0
-38*x^-1 = -1/8 // : -38
x^-1 = 1/304
-1 < 0
1/(x^1) = 1/304 // * x^1
1 = 1/304*x^1 // : 1/304
304 = x^1
x = 304
x = 304
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