# Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - Chapter 1 Review Problem Set - Page 37: 2

$-25$

#### Work Step by Step

The things being added have the same signs, so add the absolute values. The sum has the same sign as the original addends. Thus, $(-12)+(-13) \\=-(|-12|+|-13|) \\= -(12+13) \\=-25$

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