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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = 20/8 // - 20/8
14/x-(20/8) = 0
14/x-5/2 = 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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