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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/27 = 18/x // - 18/x
2/27-(18/x) = 0
2/27-18*x^-1 = 0
-18*x^-1 = -2/27 // : -18
x^-1 = 1/243
-1 < 0
1/(x^1) = 1/243 // * x^1
1 = 1/243*x^1 // : 1/243
243 = x^1
x = 243
x = 243
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