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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
52/48-(100/x) = 0
52/48-100*x^-1 = 0
-100*x^-1 = -13/12 // : -100
x^-1 = 13/1200
-1 < 0
1/(x^1) = 13/1200 // * x^1
1 = 13/1200*x^1 // : 13/1200
1200/13 = x^1
x = 1200/13
x = 1200/13
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