Answer:
Yes, i agree that 'x' can take any value , either positive or negative real number, but value of |-x| will be always positive because of Modulus sign.
Here x can be any real number.But
|-x|=x , if x<0
= -x , if x>0
= 0, if x=0
So, Conclusion is that |-x| will always will be always Positive real number whatever the value of x be.