Verified answer

7 2/3 - 2 7/8

7 (2*8)/(3*8) - 2 (7*3)/(3*8) (I do this to get the same bottom number)

7 16/24 - 2 21/24

now i want to join 7 and the 2 inside fraction

(7*24 +16)/24 - (2*24 +21)/24

168+16 / 24 - 48+21 / 24

184/24 - 69/24

115/24

you can also join 7 and 2 before anything else, might be easier to start off with

125/24...i think