3 more than X is nearly always expressed as X+3, except in some atypical number systems, which is too complicated for this Answers forum. Just go with X+3.
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x + 3
(x+y)+3
6x2-5x-6
The algebraic expression for "3 more than a number" can be written as x + 3, where x represents the unknown number. In this expression, the variable x is being increased by 3. This expression can be simplified further if needed, but the basic form is x + 3.
(75/3)+6 = X 25 + 6 = X 31 = X