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Formula
Expand the expression
$$a + a$$
$2 a$
$\color{#FF6800}{ a } \color{#FF6800}{ + } \color{#FF6800}{ a }$
 Organize the similar terms 
$\left ( \color{#FF6800}{ 1 } \color{#FF6800}{ + } \color{#FF6800}{ 1 } \right ) \color{#FF6800}{ a }$
$\left ( \color{#FF6800}{ 1 } \color{#FF6800}{ + } \color{#FF6800}{ 1 } \right ) \color{#FF6800}{ a }$
 Arrange the constant term 
$\color{#FF6800}{ 2 } \color{#FF6800}{ a }$