Verified answer

(2 2/3)³ ÷ 28 4/9=(8/3)³:256/9=512/27*9/256=2/3

2/3+2.2=2/3+11/5=10/15+33/15=43/15

43/15*75/96=215/96=2 23/96

2 23/96-4.25=2 23/96-4 1/4=2 23/96-4 24/96=-2 1/96

-2 1/96-5/7=-2 7/672-480/672=-2 487/672