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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
17/3 = 42.5/x // - 42.5/x
17/3-(42.5/x) = 0
17/3-42.5*x^-1 = 0
-42.5*x^-1 = -17/3 // : -42.5
x^-1 = 0.13333333
-1 < 0
1/(x^1) = 0.13333333 // * x^1
1 = 0.13333333*x^1 // : 0.13333333
7.50000019 = x^1
x = 7.50000019
x = 7.50000019
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