book Maths Puzzle Numerical Ability

Simplyfy the complex fraction :

Can you please explain the step by step method:

3- 2/n-4
_________

5+ 4/n-4

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book Other Question

Subtract. Express result in simplest form.

(3)/(x^2 + 4x + 3) minus (1)/(x^2 - 9)

Thanks! These are so difficult for me and I have over 75 to do. Can someone help me? Thank you!

This is a hard one!!!!

must solve and show work

x(x-3) + 4x-3 = 8x + x(3+x)