simplify
[1] 3m -2{m + 1}
[2] 3/y - 2/y-2
[1] Combine 3m - 2m into m and include the remaning constant (-2)
[2] Subtract 2/y from 3/y and include the remaining constant (-2)
You have not made clear whether the last term is 2/(y-2) or (2/y) -2. I assumed the latter. If it is 2/(y-2), then convert to a common denominator and subtract terms.