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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
35/14 = 14/x // - 14/x
35/14-(14/x) = 0
35/14-14*x^-1 = 0
-14*x^-1 = -5/2 // : -14
x^-1 = 5/28
-1 < 0
1/(x^1) = 5/28 // * x^1
1 = 5/28*x^1 // : 5/28
28/5 = x^1
x = 28/5
x = 28/5
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