Question 19406
{{{F(x)=x/(x+1)}}}then 
{{{f(x-1)=(x-1)/((x-1)+1)}}}
{{{f(x-1)=(x-1)/(x-1+1)}}}
{{{f(x-1)=(x-1)/x}}}
{{{f(x-1)=x/x-1/x}}}
{{{f(x-1)=1-1/x}}}