Note: I don't know how to do the first 2 questions but the 3rd question I know. PLEASE FIRST LOOK AT THE EXPLANATION. WE ARE NOT HERE TO GIVE OUT ANSWERS, BUT TO HELP YOU.
Step-by-step explanation:
Step 1. IGNORE THE X
Step 2. add 12 and 8 (equals 20)
Step 3. Subtract 3 from 20 (equals 17).
Step 4. Now add the x to 17
Solution: 17x
Your welcome :)
