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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35/x = 27/7 // - 27/7
35/x-(27/7) = 0
35/x-27/7 = 0
35*x^-1 = 27/7 // : 35
x^-1 = 27/245
-1 < 0
1/(x^1) = 27/245 // * x^1
1 = 27/245*x^1 // : 27/245
245/27 = x^1
x = 245/27
x = 245/27
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