x + 3x + 3 = 4x + 3
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The sum of two positive integers is positive
-1, 1 and 3
9, 11, and 139 + 2(11) + 3(13) = 9 + 22 + 39 = 70
9 and 10 9 + 2(10) = 29
The first integer must equal 77 - 69 = 8 , since doubling it increases the sum by this amount. Similarly, the second integer must = 91 - 69 = 22. Then the third integer is 69 - 22 - 8 = 39.