It is known that the set a = {a} has a unique real solution to the equation x & # 178; - 2 / 2 x + a = 1 of X}, and the set a is represented by enumeration

It is known that the set a = {a} has a unique real solution to the equation x & # 178; - 2 / 2 x + a = 1 of X}, and the set a is represented by enumeration

The answer is a = {a | a = - radical 2}