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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
53/x = 2 // - 2
53/x-2 = 0
53*x^-1 = 2 // : 53
x^-1 = 2/53
-1 < 0
1/(x^1) = 2/53 // * x^1
1 = 2/53*x^1 // : 2/53
53/2 = x^1
x = 53/2
x = 53/2
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