make 1 3/4 into an irrational number(7/4) then you get 7/4 - 7/10. multiply the denominators by their opposite denominator and get 70/40 - 28-40. Then subtract to get 42/40 and simplify to 21/20. Then get the final answer of 1 1/20 by making it a mixed number.
1 1/20