# Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - Chapter 1 Review Problem Set - Page 38: 43

$8x$

#### Work Step by Step

In order to combine like terms, we use a form of the distributive property to rewrite $12x+3x-7x$ as $(12+3-7)x$ We add inside of the parentheses: $(12+3+(-7))x=8x$

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