Walkthrough ( just cancel)

Simplify.....

12x - 4

------------

36x + 4

To do this question, all you need to do is find a number that fits into both

3 fit fits into both 12 and 36

12 = 4 times

36 = 12 times

4 fits into 4 and -4

4 = 1 time

-4 = -1 time

So the answer:

4x - 1

----------------

12x + 1