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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/17 = 2.5/x // - 2.5/x
1/17-(2.5/x) = 0
1/17-2.5*x^-1 = 0
-2.5*x^-1 = -1/17 // : -2.5
x^-1 = 0.02352941
-1 < 0
1/(x^1) = 0.02352941 // * x^1
1 = 0.02352941*x^1 // : 0.02352941
42.50000319 = x^1
x = 42.50000319
x = 42.50000319
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