15. Miss Jackson wrote this number sentence on the board.
 7x = 36
 Which procedure could be used to find a value for x that will make the number
 sentence true?
 A. Subtract 7 from 7x, and subtract 7 from 36.
 B. Multiply 7x by 7, and multiply 36 by 7.
 C. Divide 7x by 7, and divide 36 by 7.
 D. Add 7 to 7x, and add 7 to 36.