If this is
\(\lim_{x\rightarrow 0}\frac{\frac{1}{x+4}-\frac{1}{4}}{x}\)
then write it as
\(\lim_{x\rightarrow 0}\frac{\frac{1}{4(1+x/4)}-\frac{1}{4}}{x}\rightarrow \lim_{x\rightarrow 0}\frac{(1+x/4)^{-1}-1}{4x}\rightarrow \lim_{x\rightarrow 0}\frac{1-x/4+...-1}{4x}\rightarrow \lim_{x\rightarrow 0}\frac{-x/4+...}{4x}\rightarrow -\frac{1}{16}\)