Okay, that’s not exactly correct. When it comes to AutoCAD, there is no final solution and no right/wrong answer. But, this is the last solution (using AutoCAD 2009) that I’m going to post. If you don't know what I'm talking about, view my original post for the AutoCAD Design Challenge.
Offset 2 <enter> pick pick <enter> (Offset the polyline 2 units to the outside. Selecting it from the toolbar/ribbon saves an <enter> - 6)
pick pick Stretch pick pick (Stretch the right side of the part toward the left by using Osnaps and tracking to pick the implied intersection for the basepoint - 5)
Using those key points enables you to stretch the part to the left by the same x-distance created by the offset.
Notice the perpendicular Osnap for the base point that enables you to stretch by the same distance created by the offset; and at the proper angle! Object tracking and Osnaps are a powerful combination. One of those hidden gems that’s been around since AutoCAD 2000!
Thanks again to all of you that participated! Has this been fun? Helpful? I’ve certainly learned a lot!