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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
43/6 = 5.7/x // - 5.7/x
43/6-(5.7/x) = 0
43/6-5.7*x^-1 = 0
-5.7*x^-1 = -43/6 // : -5.7
x^-1 = 1.25730994
-1 < 0
1/(x^1) = 1.25730994 // * x^1
1 = 1.25730994*x^1 // : 1.25730994
0.79534884 = x^1
x = 0.79534884
x = 0.79534884
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