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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
92/9 = 74/x // - 74/x
92/9-(74/x) = 0
92/9-74*x^-1 = 0
-74*x^-1 = -92/9 // : -74
x^-1 = 46/333
-1 < 0
1/(x^1) = 46/333 // * x^1
1 = 46/333*x^1 // : 46/333
333/46 = x^1
x = 333/46
x = 333/46
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