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We can solve the equation 2x + 5 = 31 using substitution.
Let's try each number from the set {6, 13, 18, 26} and see which one makes the equation true.
1. For x = 6:
2(6) + 5 = 12 + 5 = 17 ≠31
2. For x = 13:
2(13) + 5 = 26 + 5 = 31 (True)
3. For x = 18:
2(18) + 5 = 36 + 5 = 41 ≠31
4. For x = 26:
2(26) + 5 = 52 + 5 = 57 ≠31
Therefore, the number that makes the equation 2x + 5 = 31 true is x = 13.