2X + 9 = Y or X = (Y - 9) / 2 where X is the number and Y is the result
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Let's call "a number" x. Then 5 more than twice x is 5 + 2x.
The square of 9 more than a number is equal to nine more than the square of a number. What is the number?
n = number.2n + 6=====
2x+3 where x is the unknown number
3