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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/43 = 6/x // - 6/x
18/43-(6/x) = 0
18/43-6*x^-1 = 0
-6*x^-1 = -18/43 // : -6
x^-1 = 3/43
-1 < 0
1/(x^1) = 3/43 // * x^1
1 = 3/43*x^1 // : 3/43
43/3 = x^1
x = 43/3
x = 43/3
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