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  • Brainly User
2015-10-02T00:45:16+08:00

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Let x be the number:

2x - 3  


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2015-10-02T21:18:28+08:00

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let y be the number.
3 less than 2 a number.
 2 a number - 3
2y - 3
is the algebraic expression for this, you can make the variable (y) another (x, m ,n, etc.)

Less Than says we have to lessen, or subtract, means that we should make it a (-) 
And "a certain number" should be a "variable" and that is any variable, in this case it's y.
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