Chapter 1 - Introduction to Algebraic Expressions - 1.6 Subtraction of Real Numbers - 1.6 Exercise Set - Page 50: 128

$26$

The given description, "subtract $-31$ from $-5$" translates to \begin{array}{l}\require{cancel} -5-(-31) .\end{array} Since the expression $a-(-b)$ simplifies to $a+b,$ the expression above simplifies to \begin{array}{l}\require{cancel} -5-(-31) \\\\= -5+31 \\\\= 26 .\end{array}