Greetings from Brasil...
First, let's make the mixed fraction improper:
- (3 3/8)
- { [(8 · 3) + 3]/8}
- { [24 + 3]/8}
- {27/8}
- (3 3/8) - (7/8)
- (27/8) - (7/8)
as the denominators are equal, we operate only with the numerators
- 34/8 simplifying
- 17/4
