7/24
Step 1
We can't subtract two fractions with different denominators. So you need to get a common denominator. To do this, you'll multiply the denominators times each other... but the numerators have to change, too. They get multiplied by the other term's denominator.
So we multiply 2 by 8, and get 16.
Then we multiply 3 by 3, and get 9.
Next we give both terms new denominators -- 3 × 8 = 24.
So now our fractions look like this:
16
24
−
9
24
Step 2
Since our denominators match, we can subtract the numerators.
16 − 9 = 7
So the answer is:
7
24