The sum of three numbers is 12. The first number is twice the sum of the second and third. The third number is 5 less than the first. Find the number.
The key is: first is 8, second is 1, third is 3
This is complicated if you have to show your work and not just guess and check. Set up the equations first.

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this is algebra 2

if you set up equation I know how to solve

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