# Chapter 1 - Section 1.4 - Basic Rules of Algebra - Exercise Set - Page 53: 24

$(9+3)+x=12+x$

#### Work Step by Step

The associative property for addition of real numbers states: $(a+b)+c=a+(b+c),$ that is, changing grouping does not affect the sum. Here, $9+(3+x)=$... apply the property $=(9+3)+x=$... solve the parentheses first... $=12+x$

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