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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/7 = 5/x // - 5/x
9/7-(5/x) = 0
9/7-5*x^-1 = 0
-5*x^-1 = -9/7 // : -5
x^-1 = 9/35
-1 < 0
1/(x^1) = 9/35 // * x^1
1 = 9/35*x^1 // : 9/35
35/9 = x^1
x = 35/9
x = 35/9
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