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Sticky Note
When 9 is added to twice a number, the sum is 39, the number will be?
  1. 18
  2. 15
  3. 19
  4. 20
Explanation

According to the question:  

2x + 9 = 39


2x = 39 - 9 = 30  

x = 30 ÷ 2 = 15


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