Write a Python program to perform a series of transformations on a given list.
[1,2,3,4,5,6,7]

Transformations: Multiply each element by 2, select only odd elements, subtract 3 from each remaining element.
def transformations(arr):
    result = [x*2 for x in arr if x%2 != 0]
    result = [x-3 for x in result]
    return result