Chapter 3 - Section 3.2 - Solving Equations: Review of the Addition and Multiplication Properties - Exercise Set - Page 180: 69

$x=5$

$23x+8-25x=7-9\rightarrow$ combine like terms $-2x+8=-2\rightarrow$ subtract 8 from each side $-2x+8-8=-2-8\rightarrow$ simplify $-2x=-10\rightarrow$ divide each side by -2 $-2x\div-2=-10\div-2\rightarrow$ simplify $x=5$