You have several variables but the only ones you have access to are the letters from A to F, the letters x and y, and the Memory M.
To store a value in variable x, enter the value, press [STO] followed by the key that has an x near it. To recall a value sotred in a letter variable press [RCL] followed by the appropriate key (the one that has a letter above it).
But you cannot do any algebra with this calculator, if that is what you are attempting to do. And please do read the manual that shipped with the calculator that is the best reference to the capabilities of the machine.
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