# How do you simplify (2x - 1) (x + 3) - (3x + 5) (x - 6)?

I found: $- {x}^{2} + 18 x + 27$
$= 2 {x}^{2} + 6 x - x - 3 - 3 {x}^{2} + 18 x - 5 x + 30 =$
Then collect similar terms (for example all the ${x}^{2}$):
$= - {x}^{2} + 18 x + 27$