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