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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 11/100 // - 11/100
11/x-(11/100) = 0
11/x-11/100 = 0
11*x^-1 = 11/100 // : 11
x^-1 = 1/100
-1 < 0
1/(x^1) = 1/100 // * x^1
1 = 1/100*x^1 // : 1/100
100 = x^1
x = 100
x = 100
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