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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
97/x = 2-(3/x) // - 2-(3/x)
97/x+3/x-2 = 0
100*x^-1 = 2 // : 100
x^-1 = 1/50
-1 < 0
1/(x^1) = 1/50 // * x^1
1 = 1/50*x^1 // : 1/50
50 = x^1
x = 50
x = 50
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