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20 September, 23:25

One half the sum of a number z and 3 1/2 is 4 1/2

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  1. 21 September, 02:01
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    4 1/2 (2) = 9. Multiply by 2 to get total

    9 - 3 1/2=z. Subtract 3 1/2 from total to get Z

    5 1/2 = Z
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