# Chapter 1 - Introduction to Algebraic Expressions - 1.6 Subtraction of Real Numbers - 1.6 Exercise Set - Page 49: 36

-9.1

#### Work Step by Step

For any real number $a$, we know that $-(-a)=a$. That is, the opposite of the opposite of $a$ is $a$. Therefore, when $x=-9.1$, $-(-x)=-(-(-9.1))=-(9.1)=-9.1$.

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