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20. The sum of a number and ten is three times the number

21. The sum of the product of two and a number and the product of four and another number is twenty

22. Four times the sum of a and b is the product of nine times a

23. The product of six and a number subtracted from eight is the sum of four and two times a number

24. The difference of the square of s and the square of n is equal to the product of two and b.

25. d

26. f

27. c

28. b

29. a

30. e

31. Real, Irrational

32. Real, Rational, Integer

33. Real, Rational

34. -

35.-