(9-2 2/3×2 3/8)×21/46

(9 - 2 2/3 • 2 3/8) • 21/46 =
= (9 - 8/3 • 19/8) • 21/46 =
= (9 - 19/3) • 21/46 =
= (27/3 - 19/3) • 21/46 =
= 8/3 • 21/46 = 4•7/23=28/23=1 5/23