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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
39/x+11 = 100 // - 100
39/x-100+11 = 0
39*x^-1 = 89 // : 39
x^-1 = 89/39
-1 < 0
1/(x^1) = 89/39 // * x^1
1 = 89/39*x^1 // : 89/39
39/89 = x^1
x = 39/89
x = 39/89
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