# How do you factor by grouping 12xy-28x-15y+35?

$\left(12 x y - 28 x\right) - \left(15 y - 35\right)$
$= 4 x \left(3 y - 7\right) - 5 \left(3 y - 7\right)$
$3 y - 7$ is common to both the terms
 =color(green)( (3y - 7)(4x - 5)