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If bara = bari - 2barj - 3bark, barb =...

If ` bara = bari - 2barj - 3bark, barb = 2bari + barj - bark , barc = bari + 3barj - 2bark` then find `bar(a) xx (barb xx barc) ` and `|(barb xx barc) xx barc |` .

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