SOLUTION: Algebra question. 18 + ______ 3 = 31

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Question 159540: Algebra question.
18 + ______ 3 = 31
Answer by midwood_trail(310) About Me  (Show Source):
You can put this solution on YOUR website!
Can you be more specific about the number 3 in your equation?
Do we add to 3, or divide by 3 or what?