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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/8 = 17.5/x-1 // - 17.5/x-1
14/8-(17.5/x)+1 = 0
14/8-17.5*x^-1+1 = 0
-17.5*x^-1 = -11/4 // : -17.5
x^-1 = 0.15714286
-1 < 0
1/(x^1) = 0.15714286 // * x^1
1 = 0.15714286*x^1 // : 0.15714286
6.36363625 = x^1
x = 6.36363625
x = 6.36363625
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