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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/4 = 2/x // - 2/x
14/4-(2/x) = 0
14/4-2*x^-1 = 0
-2*x^-1 = -7/2 // : -2
x^-1 = 7/4
-1 < 0
1/(x^1) = 7/4 // * x^1
1 = 7/4*x^1 // : 7/4
4/7 = x^1
x = 4/7
x = 4/7
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