Code explanation required: Slider tutorial

In regards to the slider menu tutorial, (which was a great tutorial, hats off to Bryan), I’m a newbie to actionscript. Never used it before… don’t under stand how it relates to the math generally.

Was wondering if I could get a breakdown and explanation of this bit of code:

this._x += (xMove1-this._x)/easeSpeed;

Thanks :beer:

P.S. My slider doesn’t seem to want to move to the center of my buttons, it always deviates slightly to the left. Go figure?