HP 39g+ User Manual page 171

To recall a value
To use variables in
calculations
Variables and memory management
5. Enter a name for the variable.
A
6. Press to store the result.
The results of a calculation can also be stored directly to
a variable. For example:
2 5
To recall a variable's value, type the name of the variable
and press
A
You can use variables in calculations. The calculator
substitutes the variable's value in the calculation:
65 A
3
B
.
12-3