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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 2/100 // - 2/100
10/x-(2/100) = 0
10/x-1/50 = 0
10*x^-1 = 1/50 // : 10
x^-1 = 1/500
-1 < 0
1/(x^1) = 1/500 // * x^1
1 = 1/500*x^1 // : 1/500
500 = x^1
x = 500
x = 500
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