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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
203/x = 7 // - 7
203/x-7 = 0
203*x^-1 = 7 // : 203
x^-1 = 1/29
-1 < 0
1/(x^1) = 1/29 // * x^1
1 = 1/29*x^1 // : 1/29
29 = x^1
x = 29
x = 29
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