## Algebra 1: Common Core (15th Edition)

$\frac{2d}{5}$
A key rule to remember is that subtracting a negative is the same as addition. Thus, $\frac{d}{5}$-(-$\frac{d}{5}$)=$\frac{d}{5}$+$\frac{d}{5}$=$\frac{2d}{5}$