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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/9 = 9/x-6 // - 9/x-6
2/9-(9/x)+6 = 0
2/9-9*x^-1+6 = 0
-9*x^-1 = -56/9 // : -9
x^-1 = 56/81
-1 < 0
1/(x^1) = 56/81 // * x^1
1 = 56/81*x^1 // : 56/81
81/56 = x^1
x = 81/56
x = 81/56
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