# How do you simplify (3 z^2+z)/(18z+6)?

$= \frac{z \cdot \left(3 z + 1\right)}{6 \cdot \left(3 z + 1\right)} = \frac{z \cdot \cancel{\left(3 z + 1\right)}}{6 \cdot \cancel{\left(3 z + 1\right)}} = \frac{z}{6}$