\(=\dfrac{7}{13}-\dfrac{5}{21}-\dfrac{16}{21}-\dfrac{20}{13}+\dfrac{1}{5}=\left(-\dfrac{5}{21}-\dfrac{16}{21}\right)+\left(\dfrac{7}{13}-\dfrac{20}{13}\right)+\dfrac{1}{5}\)
\(=-1-1+\dfrac{1}{5}=-2+\dfrac{1}{5}=-\dfrac{9}{5}\)
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( 7/13 - 5/21 ) -( 16/21 + 20/13 - 1/5 )
= 82/273 - 2867/1365
= -9/5
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