Nine less than twice a number equals the same number increased by four?
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There is no selected number so it would be a variable. The answer is 2n-9 (n is the number which you choose)
One increased by two equals the quotient of nine and three.
If the sum of the digits of a given number equals nine or a multiple of nine, nine is a factor of that number.
9+9=18. The number is 9.
2a+3>49
2n + 3 > 49 n > 23