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10 April, 06:04

Why are the equations w - x x = w and w x - x = w called identities?

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  1. 10 April, 06:16
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    They are called identities because:

    w-x = 0

    w = x (carry x to the other side) is the same as x = w

    in the other case:

    wx-x = w / divide by w on both side

    x - x = 0

    x = x (carry x to the other side)

    In both cases the equations are the same.
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