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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/14 = 7/x // - 7/x
5/14-(7/x) = 0
5/14-7*x^-1 = 0
-7*x^-1 = -5/14 // : -7
x^-1 = 5/98
-1 < 0
1/(x^1) = 5/98 // * x^1
1 = 5/98*x^1 // : 5/98
98/5 = x^1
x = 98/5
x = 98/5
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