15 added to a number is 16 times the number

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15 added to a number is 16 times the number

1. The phrase a number means an arbitrary variable, let's call it x.
2. 15 added to a number: 15 + x
3. 16 times the number: 16x
4. The phrase is means equal to. So we set 15 + x equal to 16x

15 + x = 16x