Answer:
 The simplified answer is 
 
 
Explanation:
 For the given expression: (− 1/x )× 1−x/1+x × x/x^2−1
 we need to simplify it
 
 = (x+1)×(x-1)
 = (x+1)×(x-1)
 eliminating x and x-1 from the given equation we get
 
 
 
 The value of x can't be zero
 As we can't divide zero by zero
 The value of x can't be one
 As we can't divide zero by zero
 The simplified answer is 
