jika f(x) = 4x dan (f o g) (x) = x/2+1 maka g(x)=..?

[tex]$\begin{align}f(g(x))&=(f\circ g)(x)\\4g(x)&=\frac x{2x+1}\\g(x)&=\frac x{2x+1}\times\frac14\\g(x)&=\boxed{\frac x{8x+4}}\end[/tex]