Help!!

-(-x-w)-(w-x)

 

Factor -1 from -(w-x)-(-x-w):
-(w-x-x-w)

 

Grouping like terms, w-x-x-w = (w-w)+(-x-x):
-((w-w)+(-x-x))

 

-x-x = -2 x:
-(-2 x+(w-w))

 

w-w = 0:
-(-2) x

 

-(-2)  =  2:
Answer: | 2x

-(w-x)-(-x-w)

= x-w+x+w

= 2x