Let's see:
5-6 = 8, this equation doesn't hold, so how do we move one of them to make this equation hold? Use your head and hands to see if we are the next Superman.
Thinking:
The number "5" becomes "3" if you subtract one, and "6" or "9" if you add one;
The number "6" can only be reduced to "5", shifted to "9" or "0" and added to "8";
The number "8" cannot be added or moved, only subtracted. After subtracting one, it can become "0", "6" and "9".
Analysis:
As a result, the number "8" becomes "0", the reduced number is added to the number "5", and the number "5" becomes "6". Then the formula becomes 6-6 = 0.