(4/15-7/6)•4/5
First make the bottom number the same
6•15=90
Bottom number is 90
But what ever you do to the bottom number you do to the top number
So 4•6=24
7•15=105
(24/90-105/90)•4/5
24/90-105/90=-81/90
-81/90•4/5
When multiplying two fractions you times both the top numbers and then the bottom numbers
-324/450
Simplest form=-162/225
Answer is -162/225