It could be a mathematical formula. If you equate it to a value, you can solve for X, if you want. For example if (X+5)/8 = 20, then X = 8x20-5, which equals 155. Now, if you mean X+5/8, then if you set it equal to 20 you get X = 20-5/8, which equals 19 3/8 or 19.375. All by itself though, X plus 5 over 8 could be anything. Or nothing.
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