# Chapter 4 - Polynomials - 4.4 Addition and Subtraction of Polynomials - 4.4 Exercise Set - Page 259: 9

$4x+9$

#### Work Step by Step

By combining like terms, the given expression, $(3x+2)+(x+7)$, simplifies to \begin{array}{l} (3x+x)+(7+2) \\\\= 4x+9 .\end{array}

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