2/1 = 2

3*9 = 27

1/1 = 1

3*3 = 9

4-2 = 2

2/2 = 1

7*3 = 21

21/5 = 4.2

Therefore, the expression simplifies to:

2 + 27 - 1 + 9 - 2 + 1 + 4.2 = 40.2