Find the sum and/or difference. Express your answer in simplest form. (Show your solution.)

1. 7 3
— + — =
5× 5×

2. 6×(squared) 12×
—————— - —— =
×-2 ×-2

3. 4× 3
—— - —— =
×+1 ×+1

4. × 5
—————— - —————— =
×(squared)–5× ×(squared)–5x

5. x–1 2
—— + —— =
×+1 ×+2​