## Intermediate Algebra: Connecting Concepts through Application

$\color{blue}{2}$
The rational expressions have the same denominator so they are similar. Add the numerators and copy the denominator to obtain: $=\dfrac{b-3+b-15}{b-9} \\=\dfrac{2b-18}{b-9}$ Factor out $2$ in the numerator to obtain: $\\=\dfrac{2(b-9)}{b-9}$ Cancel the common factors to obtain: $\\=\color{blue}{2}$