Respuesta :

Well, first of all, add 3.3 to 7.2
(10.5)
Now, divide 10.5 by 5
(2.1)
Your answer is d = 2.1
5x - 3.3 = 7.2

5x = 7.2
      - 3.3

5x = 3.9

x = 3.9/5

x = 0.78