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Calculate the value
$\sqrt{ 49 } \div \sqrt{ 7 } \times \left( - \sqrt{ 28 } \right)$
$- 14$
Calculate the value
$\sqrt{ 49 } \div \sqrt{ 7 } \times \left ( \color{#FF6800}{ - } \sqrt{ 28 } \right )$
 Move the (-) sign forward 
$\color{#FF6800}{ - } \sqrt{ 49 } \div \sqrt{ 7 } \times \sqrt{ 28 }$
$\color{#FF6800}{ - } \sqrt{ \color{#FF6800}{ 49 } } \color{#FF6800}{ \div } \sqrt{ \color{#FF6800}{ 7 } } \color{#FF6800}{ \times } \sqrt{ \color{#FF6800}{ 28 } }$
 Calculate the value that contains root 
$\color{#FF6800}{ - } \color{#FF6800}{ \dfrac { \left ( 14 \sqrt{ 7 } \right ) \sqrt{ 7 } } { 7 } }$
$- \color{#FF6800}{ \dfrac { \left ( 14 \sqrt{ 7 } \right ) \sqrt{ 7 } } { 7 } }$
 Reduce the fraction 
$- \left ( \left ( \color{#FF6800}{ 2 } \sqrt{ \color{#FF6800}{ 7 } } \right ) \sqrt{ \color{#FF6800}{ 7 } } \right )$
$- \left ( \left ( \color{#FF6800}{ 2 } \sqrt{ \color{#FF6800}{ 7 } } \right ) \sqrt{ \color{#FF6800}{ 7 } } \right )$
 Get rid of unnecessary parentheses 
$- \left ( \color{#FF6800}{ 2 } \sqrt{ \color{#FF6800}{ 7 } } \sqrt{ \color{#FF6800}{ 7 } } \right )$
$- \left ( \color{#FF6800}{ 2 } \sqrt{ \color{#FF6800}{ 7 } } \sqrt{ \color{#FF6800}{ 7 } } \right )$
 Simplify the expression 
$- \color{#FF6800}{ 14 }$
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