Simplifying Fractions With A Variable

Simplify:

$$\frac{1}{P(1-\frac{P}{N})(1-\frac{m}{P})}$$

To show that it is equal to:

$$\frac{N}{N-m}[\frac{1}{N-P}+\frac{1}{P-m}].$$

I honestly have no idea how to even start the question. I am wondering if the question is asking to go backward, i.e. to go from the second part to the first, but it doesn't seem that way. If someone could show me how to do this or even get me started would be very helpful!

Simplify:

$$\frac{1}{P(1-\frac{P}{N})(1-\frac{m}{P})}$$

To show that it is equal to:

$$\frac{N}{N-m}[\frac{1}{N-P}+\frac{1}{P-m}].$$

I honestly have no idea how to even start the question. I am wondering if the question is asking to go backward, i.e. to go from the second part to the first, but it doesn't seem that way. If someone could show me how to do this or even get me started would be very helpful!