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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^3-(216/x)-6 = 0
X^3-216*x^-1-6 = 0
-216*x^-1 = -(X^3-6) // : -216
x^-1 = (6-X^3)/(-216)
-1 < 0
1/(x^1) = (6-X^3)/(-216) // * x^1
1 = x^1*((6-X^3)/(-216)) // : (6-X^3)/(-216)
-216*(6-X^3)^-1 = x^1
x = -216*(6-X^3)^-1
x = -216*(6-X^3)^-1
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