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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
172800/x = 3 // - 3
172800/x-3 = 0
172800*x^-1 = 3 // : 172800
x^-1 = 1/57600
-1 < 0
1/(x^1) = 1/57600 // * x^1
1 = 1/57600*x^1 // : 1/57600
57600 = x^1
x = 57600
x = 57600
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