Answer: I believe it is 1/3 or -1.3. or 1. Sorry if its not right.
Step-by-step explanation:
If it's correct you would make 2/5 into 4/10, 4/5 into 8/10. Then subtract 4/10-8/10=0/4 or -0.4. Then subtract (if its 1 then you would add 0.4+1=5 then turn 5 into 10/10 then subtract 10/10-9/10=1.) 0.4-9/10=1/3.
Hope 1 of these answers is right sorry if they aren't!!
