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Macken

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  1. Macken
    If 3x+ 7y be divisible by 11 they must be separately divisible by 11 as well . So 3x is divisible by 11 and so also 7y. But since 3 and 7 are no multiples of 11, x and y must be. This implies any Ax +/- By will be divisible by 11
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