2m 7n-4 2m (3-5n) (7n-4 ) 2m-3+5n-7n+4
--------- -1 + ---------- = -------- - ---------- - ----------- = ------------------------ =
3-5n 5n-3 3-5n 3-5n 3-5n 3-5n
2m-2n+1
= -----------------
3-5n
2n 7n-4 2n (3-5n) (7n-4 ) 2n-3+5n-7n+4
------- -1 + ---------- = -------- - ---------- - ----------- = ------------------------ =
3-5n 5n-3 3-5n 3-5n 3-5n 3-5n
2n-2n+1 1
= ------------- = ---------
3-5n 3-5n