X=d+32
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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.
Let the unknown number be x and so the expression is: x+12
Let the number you are looking for be x, than 3x+8 is the algebraic expression for 8 more than triple a number.
As an expression it is: 5x+12
5n + 11