n = number.
2n + 6
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2X + 9 = Y or X = (Y - 9) / 2 where X is the number and Y is the result
The corresponding expression would be 2x - 6 = 4.
The algebraic expression is 2m+6
If the number is N then 2N - 5 = 7 then 2N = 12 so that N = 6
Well, isn't that just a happy little expression! To represent "three more than a number" in algebra, you would write it as "x + 3," where "x" represents the unknown number. Just like adding a touch of color to a painting, adding 3 to a number can bring a new dimension to your mathematical expressions.