$- 2 x - \left ( 4 x - \left ( \color{#FF6800}{ y } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ x } \right ) \right )$
$ $ Sort the polynomial expressions in descending order $ $
$- 2 x - \left ( 4 x - \left ( \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ y } \right ) \right )$
$- 2 x - \left ( 4 x \color{#FF6800}{ - } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ y } \right ) \right )$
$ $ Change the symbol of each term in parentheses when there is a (-) symbol in front of parentheses $ $
$- 2 x - \left ( 4 x + \color{#FF6800}{ 5 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ y } \right )$
$- 2 x - \left ( \color{#FF6800}{ 4 } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ 5 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ y } \right )$
$ $ Organize the similar terms $ $
$- 2 x - \left ( \left ( \color{#FF6800}{ 4 } \color{#FF6800}{ + } \color{#FF6800}{ 5 } \right ) \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ y } \right )$
$- 2 x - \left ( \left ( \color{#FF6800}{ 4 } \color{#FF6800}{ + } \color{#FF6800}{ 5 } \right ) \color{#FF6800}{ x } - y \right )$
$ $ Arrange the constant term $ $
$- 2 x - \left ( \color{#FF6800}{ 9 } \color{#FF6800}{ x } - y \right )$
$- 2 x \color{#FF6800}{ - } \left ( \color{#FF6800}{ 9 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ y } \right )$
$ $ Change the symbol of each term in parentheses when there is a (-) symbol in front of parentheses $ $
$- 2 x \color{#FF6800}{ - } \color{#FF6800}{ 9 } \color{#FF6800}{ x } + \color{#FF6800}{ y }$
$\color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ x } \color{#FF6800}{ - } \color{#FF6800}{ 9 } \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ y }$
$ $ Organize the similar terms $ $
$\left ( \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ - } \color{#FF6800}{ 9 } \right ) \color{#FF6800}{ x } \color{#FF6800}{ + } \color{#FF6800}{ y }$
$\left ( \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ - } \color{#FF6800}{ 9 } \right ) \color{#FF6800}{ x } + y$
$ $ Arrange the constant term $ $
$\color{#FF6800}{ - } \color{#FF6800}{ 11 } \color{#FF6800}{ x } + y$