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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
17/8 = 10/x // - 10/x
17/8-(10/x) = 0
17/8-10*x^-1 = 0
-10*x^-1 = -17/8 // : -10
x^-1 = 17/80
-1 < 0
1/(x^1) = 17/80 // * x^1
1 = 17/80*x^1 // : 17/80
80/17 = x^1
x = 80/17
x = 80/17
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