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10 April, 23:14

What has the sum of 21 and the difference of 7 answer

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Answers (1)
  1. 10 April, 23:49
    0
    7

    Step-by-step explanation:

    x

    +

    y

    =

    21

    x

    -

    y

    =

    7

    y

    =

    21

    -

    x

    x

    -

    (

    21

    -

    x

    )

    =

    7

    x

    -

    21

    +

    x

    =

    7

    2

    x

    =

    28

    x

    =

    14



    14

    +

    y

    =

    21

    y

    =

    7
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