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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^2+54/x = 0
54*x^-1 = -X^2 // : 54
x^-1 = (-X^2)/54
-1 < 0
1/(x^1) = (-X^2)/54 // * x^1
1 = ((-X^2)/54)*x^1 // : (-X^2)/54
54*X^-2 = x^1
x = 54*X^-2
x = 54*X^-2
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