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----
Mathematical expressions.
::
math(EXPR <output-variable> <math-expression>)
``EXPR`` evaluates mathematical expression and returns result in the
output variable. Example mathematical expression is ``5 * (10 + 13)``.
Supported operators are ``+``, ``-``, ``*``, ``/``, ``%``, ``|``, ``&``,
``^``, ``~``, ``<<``, ``>>``, and ``(...)``. They have the same meaning
as they do in C code.
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