zmienna

zmienna is the keyword for declaring variables. For now (Garniec v0.0.2) variable names can only be single characters as well as their values can only be positive integers.

zmienna a=10

will result in declaring a variable with the name a and the value 10

You can declare more than one variable

zmienna b=15
zmienna c=20
zmienna d=25

You can view all currently declared variables using pamiec.zmienne command.
Deleting all declared variables is nothing more than using pamiec.kasuj command.
If by any chance you make a mistake creating a variable

zmienna e=19

and you wished e to be equal to 10, you can correct it by using the same variable name again

zmienna e=10

if you type pamiec.zmienne now you will see that e is equal to 10.