Documentation includes Understanding flat assembler / Preprocessor :
" Just like with the assembly-time variables, you can re-define preprocessing-time variables using the previous value to make the new one. For example:
A equ 2
B equ +
A equ A B A
defines symbolic variable with value 2+2 "

but if this code enclose instructions:

display A

receives indefinite symbol.

Why? Request for help.
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piev,

Have you meant that display 2+2 shows something strange? Actually it shows glyph for codepoint 4, which in most DOS-era codepages (437/866) looks like diamond card suit symbol (♦). OTOH, in Unicode BMP and ANSI codepages (1252/1251) it has no mapping, thus default is shown, it usually looks like hollow rectangle.

Thank you for your response. Now it is clear to me.