16 decreased by 3 times the sum of 3 and a number

Take this algebraic expression in parts:

• The phrase a number means an arbitrary variable. Let's call it x.
• The sum of 3 and a number: 3 + x
• 3 times the sum: 3(3 + x)
• 16 decreased by... means we subtract 3(3 + x) from 16

3(3 + x) from 16

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