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30 March, 16:55

The difference of twice a number and 9 is less than 18

use the variable w for the unknown number

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  1. 30 March, 17:24
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    Symbolically, this statement comes out to 2w - 9 < 18.

    Adding 9 to both sides: 2w < 27. Finally, w < 27/2.
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