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I watched some of the first video on the calculus lectures someone posted, but had a question about some of the algebra when he factors something out of the equation. I've noticed stuff like this is where I get messed up. If someone could explain how this equation:

[1/(x + deltax) - 1/(x)] / deltax

turns into

(1/deltax)[(x - (x + deltax)) /(x + delta x)(x)]

The "X"s, not the "deltaXs", were written with a little subscript zero to the bottom of them, but I don't know how to do that on my keyboard, my apologies. Also, it may hard to read the way it is written, but hopefully you guys can get the jist of it. Thanks

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