Solve the following problems.
13. A number increased by 9 is 35. Find the number.
14. 18 is 5 less than a number. Find the number.
15. #8 is subtracted from a number, the result is 2 What is the number?
16. The surn of two numbers is 18. One number is 8, what is the other number
17. If 10 is added to a number, the result is 42. What is the number?
18. Twice a number minus 15 is 45. What is the number?
19. 2x + 5 = 21
20. 3n
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