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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
23/48 = 100/x // - 100/x
23/48-(100/x) = 0
23/48-100*x^-1 = 0
-100*x^-1 = -23/48 // : -100
x^-1 = 23/4800
-1 < 0
1/(x^1) = 23/4800 // * x^1
1 = 23/4800*x^1 // : 23/4800
4800/23 = x^1
x = 4800/23
x = 4800/23
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