## Algebra: A Combined Approach (4th Edition)

$-15x-10$
Step 1: Let the unknown number here be $x.$ Step 2: The sum of the number and $\frac{2}{3}$ means $(x+\frac{2}{3}).$ Step 3: The product of -15 and sum of the number and$\frac{2}{3}$ means $(-15)(x+\frac{2}{3}).$ Step 4: $(-15)(x+\frac{2}{3})=-15x+\frac{-15\times2}{3}=-15x-10.$