Identify which of the following expressions is an equation or an inequality. Write your answer on a separate sheet of paper. Do not copy the expressions anymore.

1) 7x+2-19

2) 3(x+4)- 21

3) 5x-4 <21

4) 3x-9> 5x-3

5) 3 (x-3)=4 (2x + 1)