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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
48/52 = 100/x // - 100/x
48/52-(100/x) = 0
48/52-100*x^-1 = 0
-100*x^-1 = -12/13 // : -100
x^-1 = 3/325
-1 < 0
1/(x^1) = 3/325 // * x^1
1 = 3/325*x^1 // : 3/325
325/3 = x^1
x = 325/3
x = 325/3
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