Hi

x 2x  (2x-4)= unit digit

1  2    -2 |wont work  2*-2 ≠ 2

2  4    0 |wont work  2*0 ≠ 4

3  6    2 |wont work 2*2 ≠ 6

4  8    4  

 84 is the number 

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