The document shows a series of mathematical expressions that are reduced or simplified. The expressions include addition, subtraction, and multiplication of variables and numbers. Overall it demonstrates the process of reducing complex expressions into simpler equivalent forms through mathematical operations.

1. Reduce:
424
428
795
797
2
2
3
3
A

2. Reduce:
15
12
27
4
3
3
16 

3. Reduce:
33
646425 

4. Reduce:
ac
a
c
cb
c
b
ba
b
a
x
x
x
x
x
x  ..