(7 1/2 : 6 3/4) – (2 5/6 – 4 2/9)

(7 1/2 : 6 3/4) – (2 5/6 – 4 2/9)
=(15/2 : 27/4) – (17/6-38/9)
=(15/2×4/27)-(51/18-76/18)
=10/9-(-25/18)
=10/9+25/18
=20/18+25/18
=45/18
=2 9/18
=2 1/2

:))

(7 1/2 : 6/34) – (2 5/6 – 4 2/9)
(15/2 : 27/4) – (17/6 – 38/9)
(15/2 x 4/27) – (51/18 – 76/54)
1 1/9 – 1 7/18
10/9 – -25/18 = 2x10x25/18
=45/18 : 9
=5/2
=2 1/2