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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/2.2 = 9/x // - 9/x
6/2.2-(9/x) = 0
6/2.2-9*x^-1 = 0
-9*x^-1 = -2.72727273 // : -9
x^-1 = 0.3030303
-1 < 0
1/(x^1) = 0.3030303 // * x^1
1 = 0.3030303*x^1 // : 0.3030303
3.30000003 = x^1
x = 3.30000003
x = 3.30000003
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