Any time when the letter and number together and says what is letter equal you must multiply!
For example: a=5
There is a equation and it says what is: 4a It is the same thing as multiply so what you do is 4x5 since a is equal to 5 then boom, it’s that easy you’re answer is 20.
I just wrote this if you didn’t understand much about this topic, and I hope I helped! Enjoy! (:
