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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
755/273 = 335/x // - 335/x
755/273-(335/x) = 0
755/273-335*x^-1 = 0
-335*x^-1 = -755/273 // : -335
x^-1 = 151/18291
-1 < 0
1/(x^1) = 151/18291 // * x^1
1 = 151/18291*x^1 // : 151/18291
18291/151 = x^1
x = 18291/151
x = 18291/151
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