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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4 = 9.2/x // - 9.2/x
4-(9.2/x) = 0
4-9.2*x^-1 = 0
-9.2*x^-1 = -4 // : -9.2
x^-1 = 0.43478261
-1 < 0
1/(x^1) = 0.43478261 // * x^1
1 = 0.43478261*x^1 // : 0.43478261
2.29999999 = x^1
x = 2.29999999
x = 2.29999999
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