a b and c are different prime numbers, find a set of values so that a and b are equal to 2c
There are infinite solutions to your problem, such as:
3, 43, 23 so that: 3+43 =2x23, or
5, 53, 29 so that: 5+53 =2 x 29 or
19, 43, 31 so that: 19+43 =2 x 31.......etc.
