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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
211/x = 17 // - 17
211/x-17 = 0
211*x^-1 = 17 // : 211
x^-1 = 17/211
-1 < 0
1/(x^1) = 17/211 // * x^1
1 = 17/211*x^1 // : 17/211
211/17 = x^1
x = 211/17
x = 211/17
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