Using the PEMDAS rule, we start with the equation in the parentheses (3/4 x 4/9). 3 X 4 is 12 and 4 X 9 is 36, so the answer is 12/36. You can simplify this to 1/3. -1/2 plus 1/3 can also be written as 1/3 - 1/2. Next you will want to set the denominators equal to each other. In this case, I'll set them both equal to 6.
