If you've tried everything possible, why don't we see any of your work shown?
On the first exercise, combine the two terms in the numerator into a single fraction. Do the same with the two terms in the denominator. You will then have a single fraction divided by another.
Next, use the rule that tells us to change such a division of ratios into a multiplication of ratios: multiply the top fraction by the reciprocal of the bottom fraction.
If you do not understand these instructions, then let me know, and I will type an example for you.
On the second exercise, something looks funky, to me. In the numerator, 12/x - 12/x is zero. (Did you see that cancellation of like terms?) 15 + 15 is also a combination of like terms.
After combining like terms, we have the following.
(h + 30)/h
I'm thinking that there's probably more to the second exercise than combining like terms in the numerator.
Can you retype the second expression using grouping symbols, so that I can be sure that I've got it correctly?
MY EDITS: inserted offer to provide example; fixed ambiguous statement; correct grammar mistake (urrgggh)