all of the following expressions are equivalent except
7 - x
x - 7
- x + 7
7 + (- x)

all of the following expressions are equivalent except :

7 - x

x - 7

- x + 7

7 + (- x)

since x has a sign itself, which is not dependent to 7.

pakistan's principal natural resources are arable land and water. about 25% of pakistan's agriculture accounts for about 21% [1] of gdp and employs about 43% of the labour force. in pakistan, the most agricultural province is punjab where wheat and cotton are the most grown.