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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^3+1728/x+12 = 0
1728*x^-1 = -(X^3+12) // : 1728
x^-1 = (-(X^3+12))/1728
-1 < 0
1/(x^1) = (-(X^3+12))/1728 // * x^1
1 = x^1*((-(X^3+12))/1728) // : (-(X^3+12))/1728
-1728*(X^3+12)^-1 = x^1
x = -1728*(X^3+12)^-1
x = -1728*(X^3+12)^-1
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