Question 1209328
<pre>

{{{matrix(1,3,"f(x)",""="",3x-4)}}}
{{{matrix(1,3,"g(x)",""="",x+c)}}}
{{{matrix(1,5,f(g(x)^""),""="",3(x+c)-4,""="",3x+3c-4)}}}
{{{matrix(1,5,g(f(x)^""),""="",(3x-4)+c,""="",3x-4+c)}}}
{{{matrix(1,3,f(g(x)^""),""="",g(f(x)^""))}}}
{{{matrix(1,3,3x+3c-4,""="",3x-4+c)}}}
{{{matrix(1,3,2c,""="",0)}}}
{{{matrix(1,3,c,""="",0)}}}
{{{matrix(1,13,
If,c,""="","0,",then,f(g(x)^""),""="",g(f(x)^""),for,all,values,of,x)}}} 
{{{matrix(1,13,
If,c,""<>"","0,",then,f(g(x)^""),""<>"",g(f(x)^""),for,all,values,of,x)}}}

Edwin</pre>