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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
22/x = 81/9 // - 81/9
22/x-(81/9) = 0
22/x-9 = 0
22*x^-1 = 9 // : 22
x^-1 = 9/22
-1 < 0
1/(x^1) = 9/22 // * x^1
1 = 9/22*x^1 // : 9/22
22/9 = x^1
x = 22/9
x = 22/9
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