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9 July, 16:10

The substitution property of equality allows you to say that if 7j+14k=28, and j=2, then

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  1. 9 July, 18:00
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    7 (2) + 14k=28

    14+14k=28

    -14 - 14

    14k=14

    Divide by 1.

    k=1
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