Question 767282
Actually we are simplifying when we write a double negative as a positive. One way to see this is to recognize that one interpretation of the negative is to reverse a number's direction from 0 on the number line. If the number is negative, reversing its sign makes it positive.

Ex1:  -(-2)=(-1)(-1)(2)=2
Ex2:  -(-(-2))=(-1)(-1)(-1)(2)=[(-1)(-1)](-1)(2)=(-1)(2)=-2