Question 1046714
Your expression is apparant as <pre>3a/a+3 - (a-4)/(a-2)</pre> in your compose field.  If that is what you have, then with rendering tags, you are expressing {{{3a/a+3 - (a-4)/(a-2)}}}.


The simplification:


{{{3cross(a)/cross(a)+3-(a-4)/(a-2)}}}


{{{3+3-(a-4)/(a-2)}}}


{{{6+(a-4)/(a-2)}}}


{{{(6(a-2)+(a-4))/(a-2)}}}


{{{(6a-12+a-4)/(a-2)}}}


{{{highlight((7a-16)/(a-2))}}}