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By the Rational Zeros Theorem, the possible rational zeros are:
+-{1/42, 1/21, 1/14, 2/21, 1/7, 1/6, 3/14, 2/7, 1/3, 3/7, 1/2, 2/3, 6/7, 1, 3/2, 2, 3, 6}

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