abs(16 - 2*n)
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7*(2*x - 16), or maybe 7*| 2*x - 16 |. It depends on if you want to keep the 'difference' to be a positive number.
It does not mean anything at all. "Twice a number" is only one number while "the difference" must refer to two numbers, not just one.
If: 16+2x = 36 then the value of x works out as 10
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14