# Chapter 3 - Section 3.4 - Linear Equations in One Variable and Problem Solving - Exercise Set - Page 195: 14

$x=24$

#### Work Step by Step

"Sum" indicates addition. $7+9+x=40$ $\longrightarrow$combine like terms $16+x=40$ $\longrightarrow$addition property $16+x-16=40-16$ $\longrightarrow$combine like terms $x=24$

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