Question 442576
Notice these two groupings:
{{{highlight(xy)-xa+highlight(y)-a}}}
{{{xy - highlight(xa)+ y - highlight(a)}}}
Rearrange so that we have a group of ys and a group of as.
{{{cartoon(xy-xa+y-a,xy+y-xa-a,y(x+1)-a(x+1),y*highlight(x+1) - a*highlight(x+1), (x+1)(y-a), highlight((x+1)(y-a)))}}}

Once we factor out a ys and as, we notice each has a common factor of (x+1), so we factor out x+1. 

Our final answer is :  {{{highlight((x+1)(y-a))}}}