What is 3-2.15 of 9 and 8 + 0.625-4 and 17 of 20

What is 3-2.15 of 9 and 8 + 0.625-4 and 17 of 20

15 + 0.625-4 and 17 / 20 = 9 + 3 / 8-2-3 / 20 + 5 / 8-4-17 / 20 = 3