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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
273/x = 3^0.4 // - 3^0.4
273/x-3^0.4 = 0
273*x^-1 = 3^0.4 // : 273
x^-1 = (3^0.4)/273
-1 < 0
1/(x^1) = (3^0.4)/273 // * x^1
1 = ((3^0.4)/273)*x^1 // : (3^0.4)/273
273*3^-0.4 = x^1
x = 273*3^-0.4
x = 273*3^-0.4
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