The domain of the function f(x)= x+2/4x-16 is all real numbers x except for where x equals

To find restricted value or values of x, we equals the denominator by 0, as follows:
4x-16 = 0
and now we solve for x:
4x = 16
x = 16/4
x = 4
The domain of the function is all real numbers except for where x equals 4