# How do you factor completely 2xy – xz + 2wy – wz ?

it's $\left(x + w\right) \left(2 y - z\right)$
$2 x y - x z + 2 w y - w z = 2 y \left(x + w\right) - z \left(x + w\right) = \left(x + w\right) \left(2 y - z\right)$