Question 126022
Let x = the smaller number 
Let x + 12 = the larger number 
The sum of the smaller number (x) and two times the larger number [2(x + 12)] is:

Set up equation:
x + 2(x + 12) = 39
Solve:
x + 2x + 24 = 39
3x = 15
x = 5 = smaller number 
x + 12 = 17 = larger number 
Substitute and check:
5 + 2(17) = 5 + 34 = 39