The question can be represented as the equation, 2n + 5 = 4n + 3 where n is the unknown number.
2n + 5 = 4n + 3 : subtract 2n from both sides
5 = 2n + 3 : subtract 3 from both sides
2 = 2n : divide both sides by 2
1 = n
The unknown number has been identified as 1.
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