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