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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/17 = 8.5/x // - 8.5/x
2/17-(8.5/x) = 0
2/17-8.5*x^-1 = 0
-8.5*x^-1 = -2/17 // : -8.5
x^-1 = 0.01384083
-1 < 0
1/(x^1) = 0.01384083 // * x^1
1 = 0.01384083*x^1 // : 0.01384083
72.25000235 = x^1
x = 72.25000235
x = 72.25000235
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