# Chapter 4 - Polynomials - 4.7 Polynomials in Several Variables - 4.7 Exercise Set: 26

$a-4b$

#### Work Step by Step

By combining like terms, the given expression, $9a+b-8a-5b ,$ simplifies to \begin{array}{l}\require{cancel} (9a-8a)+(b-5b) \\\\= a-4b .\end{array}

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