152.  Solve for -x

 

 

Solving: If x = -7, -x = ?
Restating: What's the negative of -7?
The negative of negative is positive.
-(-7) = 7
The answer is 7.
 

 

Note: -(-7) = +7.  -(+7) = -7.

Question: Given x = 9,  what does -x = ?   What is -(+9) ?