PLEASE HELP MEEE ;( (Theres other problem in a picture)

Write an equation that could be used to determine the missing value in each statement

a. Twice a number plus five is thirty.

b. Eight less than a third of a number is the sumlof that number and one.

C. Three is twenty-one, divided by the sum of a number and five

d. Five less than three times a number is forty-six