Well, for [2,4,40] it returns 8, 16, 24, 32, 40

$> ./solution.sh 2 4 40
8
16
24
32
40

What is wrong here?

@strahle101 This solution is correct because "All numbers are equal except for one" means that there are only two different values in the array. One of the values is met in the array only once, and the other value is met 2 or more times. So input double[]{1, 1, 2, 2, 4, 7, 5, 7, 5} doesn't follow conditions of the task. I didn't initially catch this condition too, and was solving multiple duplicates, like you.

Does removal of spaces change anything?

Why decimal module is imported?