If the absolute value of a is divided into a = - 1, then the value range of a is () -1 means negative 1. Explain the reason

If the absolute value of a is divided into a = - 1, then the value range of a is () -1 means negative 1. Explain the reason

The meaning of absolute value equal to a is that the distance from the exponential axis to the origin is a, when a is greater than or equal to zero | a | = a, and a is less than zero | a | = - A
The absolute value of a is a = - 1
So | a | = - A, a is less than zero