How do you simplify (-18x^2 + 7x - 14) - (-20x^2 + 17x - 12)?

$\left(- 18 {x}^{2} + 7 x - 14\right) - \left(- 20 {x}^{2} + 17 x - 12\right)$
$= - 18 {x}^{2} + 7 x - 14 + 20 {x}^{2} - 17 x + 12$
$= \textcolor{b l u e}{\left(- 18 {x}^{2} + 20 {x}^{2}\right)} + \textcolor{red}{\left(7 x - 17 x\right)} + \textcolor{g r e e n}{\left(- 14 + 12\right)}$
$= \textcolor{b l u e}{2 {x}^{2}} \textcolor{red}{- 10 x} - \textcolor{g r e e n}{2}$