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13 May, 00:03

D-21.4=87.9

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  1. 13 May, 00:27
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    D-21.4=87.9 / solve for D

    add 21.4 to both sides

    D - 21.4 + 21.4 = 87.9 + 21.4

    simplify

    D = 109.3
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