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Find the sum of all positive whole numbers $x$ such that $2x-7 < 21$.

 Apr 15, 2019
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2x - 7 < 21    add 7 to both sides

 

2x < 28       divide both sides by 2

 

x < 14

 

So....this would be the sum of the integers 1 to 13, inclusive  =   13 * 14 / 2  =   91

 

 

cool cool cool

 Apr 15, 2019

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