Answer:
x = 5 or x = 3
Step-by-step explanation:
The absolute value function always returns a positive value.
However, the expression inside can be positive or negative, that is
x - 4 = + 1 or x - 4 = -1
x - 4 = - 1 ⇒ x = - 1 + 4 = 3
OR
x - 4 = 1 ⇒ x = 1 + 4 = 5
