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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
33/x = 100 // - 100
33/x-100 = 0
33*x^-1 = 100 // : 33
x^-1 = 100/33
-1 < 0
1/(x^1) = 100/33 // * x^1
1 = 100/33*x^1 // : 100/33
33/100 = x^1
x = 33/100
x = 33/100
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