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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2 = 106/x // - 106/x
2-(106/x) = 0
2-106*x^-1 = 0
-106*x^-1 = -2 // : -106
x^-1 = 1/53
-1 < 0
1/(x^1) = 1/53 // * x^1
1 = 1/53*x^1 // : 1/53
53 = x^1
x = 53
x = 53
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