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Formula
Calculate the value
$\left( 4-2i \right) - \left( -2+5i \right)$
$6 - 7 i$
Calculate the value
$\left ( 4 - 2 i \right ) \color{#FF6800}{ - } \left ( \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ + } \color{#FF6800}{ 5 } \color{#FF6800}{ i } \right )$
 Change the symbol of each term in parentheses when there is a (-) symbol in front of parentheses 
$\left ( 4 - 2 i \right ) + \color{#FF6800}{ 2 } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ i }$
$\left ( \color{#FF6800}{ 4 } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ i } \right ) \color{#FF6800}{ + } \color{#FF6800}{ 2 } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ i }$
 Get rid of unnecessary parentheses 
$\color{#FF6800}{ 4 } \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ i } \color{#FF6800}{ + } \color{#FF6800}{ 2 } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ i }$
$\color{#FF6800}{ 4 } - 2 i \color{#FF6800}{ + } \color{#FF6800}{ 2 } - 5 i$
 Add $4$ and $2$
$\color{#FF6800}{ 6 } - 2 i - 5 i$
$6 \color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ i } \color{#FF6800}{ - } \color{#FF6800}{ 5 } \color{#FF6800}{ i }$
 Calculate between similar terms 
$6 \color{#FF6800}{ - } \color{#FF6800}{ 7 } \color{#FF6800}{ i }$
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