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Formula
Expand the expression
$\left( 2a-5 \right) - \left( 5-a \right)$
$3 a - 10$
Organize polynomials
$\left ( \color{#FF6800}{ 2 } \color{#FF6800}{ a } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \right ) \color{#FF6800}{ - } \left ( \color{#FF6800}{ 5 } \color{#FF6800}{ - } \color{#FF6800}{ a } \right )$
 Get rid of unnecessary parentheses 
$\color{#FF6800}{ 2 } \color{#FF6800}{ a } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ - } \left ( \color{#FF6800}{ 5 } \color{#FF6800}{ - } \color{#FF6800}{ a } \right )$
$2 a - 5 - \left ( \color{#FF6800}{ 5 } \color{#FF6800}{ - } \color{#FF6800}{ a } \right )$
 Sort the polynomial expressions in descending order 
$2 a - 5 - \left ( \color{#FF6800}{ - } \color{#FF6800}{ a } \color{#FF6800}{ + } \color{#FF6800}{ 5 } \right )$
$2 a - 5 \color{#FF6800}{ - } \left ( \color{#FF6800}{ - } \color{#FF6800}{ a } \color{#FF6800}{ + } \color{#FF6800}{ 5 } \right )$
 Change the symbol of each term in parentheses when there is a (-) symbol in front of parentheses 
$2 a - 5 + \color{#FF6800}{ a } \color{#FF6800}{ - } \color{#FF6800}{ 5 }$
$\color{#FF6800}{ 2 } \color{#FF6800}{ a } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ + } \color{#FF6800}{ a } \color{#FF6800}{ - } \color{#FF6800}{ 5 }$
 Organize the similar terms 
$\left ( \color{#FF6800}{ 2 } \color{#FF6800}{ + } \color{#FF6800}{ 1 } \right ) \color{#FF6800}{ a } \color{#FF6800}{ + } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \right )$
$\left ( \color{#FF6800}{ 2 } \color{#FF6800}{ + } \color{#FF6800}{ 1 } \right ) \color{#FF6800}{ a } + \left ( - 5 - 5 \right )$
 Arrange the constant term 
$\color{#FF6800}{ 3 } \color{#FF6800}{ a } + \left ( - 5 - 5 \right )$
$3 a + \left ( \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \right )$
 Arrange the constant term 
$3 a \color{#FF6800}{ - } \color{#FF6800}{ 10 }$
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