The answer could be any number between 39 to 45.
When doubled this produces 78 to 90. and with 7 subtracted this gives 71 to 83.
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The answer is 11 !
This forms an equation which solves nicely: 2x-7 = x-1 x-7 = -1 x = 6
If the number is n then twice the number is 2n and 7 less than twice the number is 2n - 7This could also be a boolean variable based on another variable. If the number is less than or equal to 3.5, the variable is false. Otherwise, it is true.
One less than twice a number = (X times 2) minus 1, (where X = your number of choice).