#### Answer

$\frac{x-3}{5}$

#### Work Step by Step

To simplify, divide both the numerator and denominator by their greatest common factor.
Use the distributive property to find the GCF.
$\frac{5x-15}{25}=\frac{5(x-3)}{25}=\frac{5(x-3)\div5}{25\div5}=\frac{x-3}{5}$