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SeaCentaur5
The word "sum" implies that this equation involves the addition of two or more numbers. Using 'x' in place of "a number" and 'y' as "the sum" we get this:

y=x+.5
Let the unknown number be x.

Sum means addition, so sum of an unknown number and 0.5 = x + 0.5.

Hence, the algebraic expression is x + 0.5

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