let A={XEW/XCL2Z B-{XEN/12x269
and c= $3,5% verify that
;-) A X (BUC) = (ARB) U (AXC)
ID AXBnc) - (AXB)(fixe)
(AUB) XC- CHX) UBXO
look
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it's not a question
it's inappropriate
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