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23 February, 08:19

What is this 15=2+4-d

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  1. 23 February, 10:16
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    15=2+4-d

    15=6+d

    move 6 to the other side

    sign changes from + 6 to - 6

    15-6=6-6-d

    15-6=-d

    9=-d

    Multiply both sides by - 1 to get + d.

    (9) (-1) = (-d) (-1)

    Answer: d=-9
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