The book gives an answer of

. This is probably very simple problem but I really don't understand how to workout a problem like that.

I would appreciate if anyone would like to show the steps involved getting to that answer and maybe point to a related lesson

It's been a few days so I'm going to work the problem out how I would do it. I would start by getting rid of the complex fraction by flipping the bottom and multiplying.

The starting equation.

Flip the bottom and multiply.

Multiply the second term.

Then I would get a common denominator, which will be x:

Multiplying the first term by (x/x) to get the common denominator.

Done the multiplication.

Combined the fractions for subtraction since we have a common denominator.

Difference of squares identity where (x+1)(x-1) = x² - 1.

Distribute the negative.

Simplify the numerator.

Ta da!