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17 January, 16:34

Is 12a-a simplified?

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  1. 17 January, 16:56
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    12a-a

    =12a-1a

    =12a+-1a

    =a+a+a+a+a+a+a+a+a+a+a+a+-a

    =a+a+a+a+a+a+a+a+a+a+a

    =11a
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