Which equation correctly solves this formula for r?

What does x = in this equation x+3+2x=x+5

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Due to a packaging error, 4 cans labeled diet soda were accidentally filled with regular soda and placed in a 12 pack carton of diet soda. two cans were randomly selected from this 12 pack. what is the probability that both cans were regular soda?