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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1764/x-3 = 0
1764*x^-1 = 3 // : 1764
x^-1 = 1/588
-1 < 0
1/(x^1) = 1/588 // * x^1
1 = 1/588*x^1 // : 1/588
588 = x^1
x = 588
x = 588
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