Two times a number is the same as the difference between the number and four.

Answer 1

2x = x-4

x =-4

2(-4) = -4-4

-8 = -8

OR if by chance, the problem meant

2x = 4-x then

3x =4

x =4/3

2(4/3) = 4-4/3

8/3 = (12-4)/3 = 8/3

since the 1st answer comes out to an even integer, it's the likely required answer = -4