[expr] integer modulus operator

If "''a'' [==] ''b'' '''%''' ''c''", then "''a'' [==] ''b'' [-] (''b'' [/] ''c'') [*] ''c''" <<br>>
Alternatively: (''x'' [/] ''y'') [*] ''y'' [==] ''x'' [-] (''x'' '''%''' ''y'')


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