For $x\in R-\left\{0,1\right\},$ let $f_1\left(x\right)=\frac{1}{x},$ $f_2\left(x\right)=1-x$ and $f_3\left(x\right)=\frac{1}{1-x}$ be three given functions. If a function, J(x) satisfies $\left(f_2^o{J}^o{f}_1\right)\left(x\right)=f_3\left(x\right)$  then $J\left(x\right)$ is equal to :-