To simplify the fractions in the first part of the equation:

1 7/12 = 19/12
3/8 + 5/12 = 9/24 + 10/24 = 19/24

So, the expression becomes:
19/12 / 19/24

To divide by a fraction, you need to multiply by the reciprocal of the fraction. Therefore, the expression simplifies to:

(19/12) * (24/19) = 24/12 = 2

Now, let's simplify the fractions in the second part of the equation:

17/36
7/12 - 5/9 = 3/4 - 5/9 = 27/36 - 20/36 = 7/36

So, the expression becomes:
17/36 / 7/36

Again, to divide by a fraction, you need to multiply by the reciprocal of the fraction. Therefore, the expression simplifies to:

(17/36) * (36/7) = 17/7 = 2 3/7

Therefore, the final answer is:
2 = 2 3/7